these are pretty much just copy pasted from my FZC stuff, but I thought it could be helpful here too
Rankings (aka Tier List)
Top (the best machines, and are generally good for all cups)
1 - Night Thunder 2 - Blood Hawk 3 - Twin Noritta 4 - Deep Claw 5 - Golden Fox
High (Best of the rest, still great on all cups and are good starting machines)
6 - Sonic Phantom 7 - Wonder Wasp 8 - Red Gazelle 9 - Mighty Typhoon 10 - Space Angler
Mid (not bad but most have a few negatives, still generally good)
11 - King Meteor 12 - Queen Meteor 13 - White Cat 14 - Astro Robin 15 - Super Piranha 16 - Little Wyvern 17 - Blue Falcon 18 - Death Anchor 19 - Moon Shadow 20 - Elegance Liberty 21 - Mad Wolf
Low (cant do most skips in the game, but can still be used for fun)
22 - Wild Goose 23 - Dragon Bird 24 - Mighty Hurricane 25 - Great Star 26 - Hyper Speeder 27 - Big Fang 28 - Green Panther
Bottom (dont even bother these are not even fun to use)
29 - Iron Tiger 30 - Panzer Emerald 31 - Fire Stingray 32 - Wild Boar 33 - Crazy Bear 34 - Black Bull
and which skips can be done by em (using abbreviations for the machines, for example SPh - Sonic Phantom, SPi - Super Piranha, WG - Wild Goose, etc.)
Clip Oval NT,BH,TN,DC,BF,GF,WC,AR,DA,RG,WW,SPi,SA,MT,QM,LW,KM,SPh,EL,MS
Volute NT,BH,TN,DC,SPh,GF,WW,RG,SA,MT,QM,KM,WC,AR,SPi,LW,BF,MS,MW,EL
Volute 2 All
Box Rink BH,DC,GF,WW,SA,MT,TN,KM,SPh
Caterpillar 1/2 All besides BB,PE,FS,CB,WB,GP
Expansion Park 1/2 (not really recommended for anything besides Course/Lap runs) NT,BH,DC,TN,GF,WC,AR,RG,WW,SPh,SA,MT,QM,LW,KM,SPi,EL,MS
Slip Highway 1/2 All
Forked Road NT,BH,TN,DC,BF,GF,WC,AR,RG,MW,WW,SPh,SPi,SA,MT,QM,KM,LW,MS,EL
Flower BH,TN,DC,GF,WW,SA,MT,SPh…still to find more
Peak Jump All besides BB,FS,PE,WB,CB
Forked Road 2 BH,TN,DC,GF,SPh,TM,WW,SA,KM
Uber Forked Road 2 (yeah not really worth it for a game run, maybe a cup run if you are mad enough) DC,TN
Peak Jump 2 All
Uber Peak Jump 2 (another one that probably isnt worth it to try) DC
Port Town 2/Red Canyon/White Land 2 All (in RC's case you may need to do alternative ways)
If you dont know bout any of these, here is a link to guide bout them https://fzerocentral.org/viewtopic.php?t=14336
Hope this helps some of you
I've also made a video to showcase all these skips