Well, the answer is totally up to you. However, there are certain turtle species that are more popular than others. Generally speaking, most tortoises need the same care as each other. However, there are certain differences that you may want to consider. For example, a smaller tortoise, you may want to consider a Mediterranean Spur-thighed tortoise. You do have to understand, though, that tortoises live a long time, so it is not a decision that you should take lightly.
If you want a larger, more social tortoise, then an African Spur-thighed tortoise is a highly popular choice, but they do grow rather large, up to thirty-six inches long in fact. If you want something with a little more color, the red-footed tortoise from South America is a stunning species that are beautiful to look at. However, their requirements are where the differences are more drastic. They will eat meat like baby mice and chicks and need a humid habitat.
So, what pet tortoise should you get? The length of their lives makes this a very difficult question to answer. The best thing that you can do, is to talk to owners, see what they feel personally. Have some time with the different species, and see which have the personality that you prefer before making the life-long choice.