>>12322137digimon world 1: glitchy nonsensical single-mon-raising game, hard as balls and early installment weirdness and very demanding (also came out before the first anime so no megas)
digimon world 2: roguelike dungeon crawler, extremely grind-heavy, relies on dna digivolving, 3 digis/party, think the roguelike equalveint of dragon quest monsters
digimon world 3: 1v1 digimon battles with tag team, dna digivolving/blast digivolving as super attacks, not as grind-heavy as 2 but still a bit up there, north american release has literally no post-final-boss gameplay whatsoever
digimon world 4: hack and slash with digimon, brings back dungeon crawler elements
digimon world dawn/dusk: easily the most recommended coming from pokemon, a traditional mon-collecting rpg filled with grinding, painful fetch quests, a poorly-translated plot and just barely not enough bad design decisions to make it unfun, but loadsemons and solid gameplay
digimon world ds: came before dawn/dusk, not really bad but its like playing black/white instead of black/white2, you might as well get dawn/dusk
digimon world championship: takes dw1's monster-raising style and makes a full game out of it, basically no rpg elements but the closest thing to a full game based on the original tamagotchi toys you'll find so if you like painstakingly raising tiny monsters to fight until they die you'll love it
lost evolution: japan-only, gameplay of dawn/dusk with digivolution system of dw1 eg you have one partner who can turn into lots of different things that you have to unlock
super xros wars: japan-only, might as well be the third part after ds and dusk/dawn
redigitize: like super xros wars but styled after the original anime story/character-wise, 5 partners, japan-only but an enhanced 3ds port is coming out so maybe bandai will stop being lazy shits and translate it
adventure: literally the first season of the anime in video game form, fucking awesome nostalgia and fanservice but again japan-only