So today I will deal with the subject of which tomatoes are the best ones to grow. Of course, having said that, the most immediate thing that comes to mind is "best for whom".
Obviously each of us will have different ideas on what we want so I will start off with a quick list of the things to consider when choosing which tomato variety to grow.

Determinate or Indeterminate - One of the principle considerations that you will need to keep in mind when deciding on tomato varieties is whether Determinate or Indeterminate varieties suit your needs better.
In short Determinate plants require less space, less maintenance and can be good for someone with time or space restrictions. They grow, produce their fruit then die. Don't plant a lot of them together unless you plan on making sauces, because they will all fruit together.
Indeterminate varieties grow and fruit through the whole season so they are perfect for a continuous supply of tomatoes for the table. They do require a lot more space and care.

Heirloom or Hybrid - If you want to grow something Traditional then you may look into one or more of the Heirloom varieties (essentially the original strains). There are some tremendous plants here and they taste better than the hybrid strains but they can be more susceptible to diseases and a little finicky.
Hybrid varieties have essentially been cross-bred to enhance certain traits (such as disease resistance) and can be a good starting variety for the novice gardener.

Other Considerations - Other things to keep in mind are whether you are planning on having a garden or growing them in a container, exactly what the purpose is for your growing them and after all that which of the potential varieties you are considering will grow well in your local conditions.

So with the above in mind here are my top ten recommendations... and why I chose them?

1) Brandywine - Of Amish origin, this is an Indeterminate Heirloom which produces large fruit (one to two pounds). A pretty pink inside with a nice red flesh. They are my number one because of taste, they are simply the best. No disease resistance though, keep that in mind.

2) San Marzano - Italian Indeterminate Heirloom. Plum shaped, bright red, slim fruits. For saucing they are the best. Sweeter and less acidic than the ever popular Roma variety they are good in warm climates and have a long season.

3) Blondkopfchen - German (meaning "little blond girl") Indeterminate Heirloom. The best tasting Cherry tomato variety out there. Sweet and citrus flavoured, these grape sized tomatoes produce big yields in clusters of 20 or more. Yellow-gold colour, disease and cracking resistant and grows well in most climates.

4) Black Prince - Russian Indeterminate Heirloom. Smaller (2 to 3 ounce) deep coloured fruits which are very juicy and incredibly rich flavoured. This variety originated in Siberia and is (not surprisingly) good in cooler climates. Can be difficult to find.

5) Lemon Boy - Indeterminate Hybrid. Fairly easy to grow and disease resistant.
These tomatoes are fairly low in acid and so are good for those prone to heartburn. Lemon yellow in colour they have a fantastic flavour and are a god talking point (like all coloured tomatoes)

6) Green Zebra - Indeterminate. This plant whilst not strictly an Heirloom is also not truly a Hybrid. Developed by Tom Wagner in the early 1980's, it is an open-pollinated variety. Dark green and yellow striped it produces smaller (three ounce) tangy / sweet fruits. Wonderful colour to add to your salads and good in Mediterranean dishes. It has a distinctive flavour.

7) Great White - Indeterminate. Like the Green Zebra this plant is not truly either Heirloom nor Hybrid. Developed by Gleckler Seeds Co. in the 1990's it came from a natural mutation of other seeds that were being grown at the time. Produces large (up to 2 pound) creamy white tomatoes that can have a yellowish hue at the blossom end when ripe. Very juicy mild sweet flavour and wonderful colour for the table. Very hardy and good in hot climates.

8) Black Krim - Russian Indeterminate Heirloom. The second Russian entry this plant produces medium large (12 to 14 ounce) fruit that are a dark reddish brown. Delicious flavour it is mildly salty and is the perfect choice for people on low salt diets. This one can be successfully grown in containers, making them a fairly unique Indeterminate. Does split and crack easily so watch your watering pattern.

9) Cherokee Purple - Indeterminate Heirloom. Said to have originated from the Native American Cherokee tribe. It produces medium fruit (10 to 12 ounces) of a dirty pink / purple with brownish shoulders. A very sweet mildly acidic taste.

10) Husky Gold - Indeterminate Hybrid. Lucky last this plant is a dwarf Indeterminate which like the Black Krim means that they can be grown by people who have limited space to spare. As a hybrid it is disease resistant and is easy to grow. It produces deep golden-coloured fruit of about 8 ounces. Mild taste which can benefit from a vinaigrette dressing.

Summary - As you can see from my choices I like these varieties mostly for their taste but also for their appearance and other unique characteristics that they possess. Whilst any "best" list is open to debate I am certain that you will be able to find something to your taste here. Try them out and see what you think.