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I thought really hard on this and I think the answer is RSE.
>huge Pokemon selection out of the gate
>isn't heavy handed on the story, gives you your cast and cuts you loose
>a little open ended since you can go to Slateport early if you want
>contest hall in RS and faux battle frontier in E for something different super early in the game
>challenging fights in the biking route Brenden/May battle and Watson being a nuzlocke killer
>routes aren't super huge but still have optional areas for you if you keep Cut
>once you get Rock Smash you can backtrack to grab some uncommon Pokeballs + EXP Share if you so choose
>momentum keeps up till Flannery
After RSE I'd put HGSS because of how enjoyable it is and then after that I'd put BW2, who gets huge points for shit like the optional lv.35 Volcarona under Driftviel and places like Castelia just being fuckhuge and full of stuff to do without getting deep into the game.
DPPt earlygame is the worst thing about it, no idea why anyone would put that desu.