I want to hear other people's thoughts and experience ^^ So far I played Project Diva, 2nd, and Extended on the psp, Mirari on 3Ds, and starting to play Mega Mix on Switch.
i've played mirai dx on 3ds, mega mix on switch, and mega mix+ on steam! i love the series so much. i didn't find mirai very hard, but i love the chibis and the inclusion of gumi along with the little bonus minigames in it. mega mix i remember digitally preordering and was obsessed with it. also being able to play it on the go was super nice. i do really wish there was a physical version of the game just bc i would love to have miku on the shelf (they only did it for the jp version :/ ). i was super hesitant for a really long time to get mega mix+ bc i figured it'd be just the same as the switch version, but i finally caved in and got it during the steam summer sale with all the dlc songs and personally it feels like the definitive way to play future tone/mega mix. it runs super well even on my lowish resource pc and i love that you can switch between the shaders. also the modding community is super active and i love downloading unofficial modules and song packs. mega mix+ is currently my go to when i want to play a rhythm game :3