if you don't have the budget for one of the color tamas, like the P's binary suggested, i would also suggest maybe getting a v6, the Music Star.
there's a lot of cool events your tamagotchi gets to go to (like their own concerts! so cute!) and the three types of music skills are a fun way to engage the player with every gen of pet.
since its the original small size, it's also a nice first tamagotchi to get if you're getting back into playing.
hope our perspectives help!
check out youtube video reviews, too - they can help you get a feel for what each version of tama is like!