ok personally im interested in this becoming a more detailed serious discussion as id like to come up with good stages for counterpicks so my thoughts
neutral stages in order of preference
Smashville- one moving platform is perfect, it doesnt interfere with final cutter, you can use it to land on with final cutter as a getaway for mind games or avoid punishment, and you can use this platform to avoid campyness plus its a small stage which gives campy players less range to hide in
Lylat Cruise- not sure if this will still be considered neutral but anyways i like the slanted edges as kirby can use these to avoid projectiles without even crouching and crouch ones that would normally hit him, kirbys cutter follows the ground so sometimes his projectile can hit opponents when they cant shoot him back, and the tilting rarely screws up kirbys recovery but can screw up someone like say wolf
Yoshi's Island- fairly good stage, stone form can slide on tilting platform, and you can counter someone comming up vertically from below the edge by stone forming on the slant above the edge (ike maybe?) but also have to be careful to not die if you accidently use stone right on the ledge and end up sliding down, and support ghosts can screw up ness and lucas pk thunder recovery
Final Destination- i obviously dont like this stage better then battlefield for characters with chainthrows or good projectiles as well its completely flat
but for everyone else well its completely flat lol so can spam final cutter if you want for spacing and well the best thing is when the corners gimp people and also inhale and spit into the corner and stage spiking yay
Battlefield- not really bad just my least favorite... there are about 4 places to land with final cutter so cant use that move as much and platforms help approach against projectile characters... yeah its a good stage just i think its the least advantageous to me at least with the exception of projectile characters (wolf still does fairly well here though as the platforms are perfect sweetspot range)
ok thats all for now since those are the stages that obviously are allowed in tournies, also i like halberd and delfino as they have the floating platforms which i think give kirby the option of comming up through the floor rather then being having to come from the edge or the top, and if someone else pops their head up through the main platforn you can use the final cutter spike of doom :D
anyways i would like to hear other peoples opinions since mine probably dont matter much