i think that if it is your first lizard or animal of a certain species than it is fair to look for one that is easier to maintain, or if you know you don't have a lot of time to devote to a high maintenance animal but you do have enough for an animal with lesser requirements than it is wise to choose one with the lesser needs. i think the ease of taking care of an animal is certainly something to be considered before making your purchase.

cresteds, gargoyles or leopard geckos are all good choices. cresteds and gargoyles are easiest in respect to temperature needs--room temp is fine for them. leo need a little heat--a uth keeping one side at about 86-88 is good. leos are easy to feed--crickets, mealworm, superworms, etc. cresteds and gargoyles can be fed an insect free diet if you wish, if you feed them crested or gargoyle diet. i still like to give mine crickets at least once a week. leos are terrestrial so their enclosure needs to be wider rather than taller, cresteds/gargoyles are arboreal so they need a taller enclosure with perches and places to jump. those are just a few differences, to possibly help you decide.