There are actually many different Tamagotchis you can choose from! Some you may really enjoy, and some not so much.
Like Violetchiluvr3 said, you can check out the logs to get a feel for some of the Tamagotchis there are, or you can also do some research here on Tamatalk, or just on the internet!
Some of the main versions are, (Not all versions)
P1/P1 (Originals)
V1 (Connection)
V2
V3
V4/V4.5
V5/V5.5
V6
Tama-go (Newest, in english)
Tamagotchi Plus Color (Japanese, in colour)
Tamagotchi iD/iD L (Japanese, in colour, newest)
I'm not going to explain every one to you since it'd take a while, but some are lower-maitenance, and some are higher. You'll just have to choose the right one for you!
I recommend going to
https://www.tamenagerie.com/ for information, but there are many other sites too! ^^
Hope you find one that fits you! Or, you can just buy a whole bunch! xD