(Final Destination > Battlefield > Stadium > Fountain of Dreams > Yoshi's Story > Dreamland)
Final Destination : Raw ground game, all Roy has.
Battlefield : Good Roy combos here, he can waveland onto platforms with ease.
Stadium : Lots of room for dash dancing, the platforms are convenient for Roy.
Fountain of Dreams : Low platforms, Roy has a decent combo game here, early Forward Smash kills.
Yoshi's Story : Platforms are in awkward positions for Roy and not much room to dash dance. At least he has early Forward Smash kills.
Dreamland : Absolutely atrocious stage for Roy. The platforms are terrible for him and this level is too large for Roy to get early Forward Smash kills.