should i buy the gba pokemon versions (ruby, sapphire, emerald, firered, leafgreen, soulsilver, heartgold) or should i skip and just get the 3ds versions (omegaruby and alphasappire i can also get the hg and ss on DS) but i cant help but feeling nostalgia for the gba (though i havent played them before ??)

The GBA versions are far superior. Idk why but I like the old, "shitty" graphics rather than this fancy stuff. You were supposed to focus on your trainer and your pokemon in the game, the battles and story, not the looks