there really are no "easy" puffer honestly. all require immaculate water parameters as they are more prone to bad water quality, they all require hard shelled foods that trim their teeth pretty frequently like snails, crabs, clam, mussel etc. and if you want corals you pretty much cant put a puffer without possibly risking corals.
more importantly before you figure out what type of puffer is best, you should let us know what size tank your looking to get/have, what you currently have livestock wise in there(if any at all). as long as you have the correct size tank for the specific species and you are willing to keep up with their constantly growing teeth by breeding snails or feeding pieces of clam shell with meat on it for them to scrape their teeth you would be good and have the majority of puffer species covered that you could own.