If it's any consolation opinion for you. I liked beast machines at the time because of how it looked like my favorite arcade game. Virtual On.

 

G1

Prowl: love his tech spec and Bob Budiansky and Dreamwave's interpretation of him
Ironhide
Blurr
Rodimus Prime
Sunstreaker: Love the Dreamwave interpretation "Had to wipe Bumper's tailpipe." Funniest TF line ever!

Megatron
Soundwave
Starscream
Thunderwing
Scorponok: last 2 due to Marvel
Ruckus: love his MTMTE profile
Ramjet: love his MTMTE profile

BW

Megatron
Inferno
Terrorsaur: BW Starscream and love that voice

Silverbolt
Airrazor
Depth Charge

RID

All Predacons and Decepticons

Prowl
Ironhide
Ultra Magnus

Armada

Overload: love his MTMTE profile
Red Alert: love him in the PS2 game

Megatron
Starscream
Predacon: love his MTMTE profile
Thundercracker: love the colour scheme
Tidal Wave: see the PS2 game

Energon

Scorponok

Rodimus
Prowl: If only Energon had gotten MTMTE profiles
Ultra Magnus: love the colour scheme

Cybertron

Scourge
Ransack
Crumplezone
Thunderblast

Movie

Ratchet
Optimus Prime

Megatron
Barricade
Blackout
Starscream: love the voice
Bonecrusher
Wreckage: great toy
Incinerator: great toy

 

G1: Starscream, Shockwave, and Jazz.

Beast Wars: Cheetor, Dinobot, Blackarachnia, Inferno, Silverbolt, and Megatron.

Beast Machines: Cheetor, Blackarachnia, and Megatron.

Cybertron: Sideways, Starscream, Jolt, Megatron, Snarl, and Scourge.

Movie: Blackout, Starscream, Bumblebee, Jazz, Ratchet, Barricade, and Brawl.

Animated: Bumblebee, Shockwave, Blitzwing, Jazz, Starscream, Megatron, and Prowl.

 

Autobots/ Maximals: G1 Optimus, G1 Springer, G1 Jazz, G1 Ironhide, G1 Grimlock, G1 Jetfire , BW Optimus, BW Dinobot, BW Rhinox,BM Cheetor, RID Prowl, RID Spychangers,Armada Scavenger, Armada Jetfire, Cybertron Optimus, Cybertron Vector Prime, Cybertron Hot Shot, Cybertron Landmine, Cybertron Overhaul/Leobreaker, Cybertron Evac, Cybertron Jetfire, Cybertron Wing Saber, Movie Ironhide, Animated Optimus, Animated Bulkhead, Animated Prowl, Animated Jazz, Animated Grimlock, Animated Wreck-Gar

Decepticons/Predacons: G1 Starscream, G1 Blitzwing, G1 Megatron/Galvatron, G1 Cyclonus, G1 Soundwave, BW Megatron, BW Waspinator/BM Thrust, BW Inferno, BW Rampage, BM Jetstorm, RID Sky-Byte, RID Scourge, Armada Sideways, Armada Starscream, Energon Scorponok, Cybertron Megatron, Cybertron Starscream, Cybertron Thundercracker, Cybertron Scourge, Cybertron Mudflap, Cybertron Lugnutz, Movie Starscream, Animated Starscream, Animated Blitzwing, Animated Lugnut, Animated Lockdown, Animated Constructicons.

 

G1. Optimus, Jazz, Thundercracker, ironhide, soundwave, Grimlock and megatron

Headmasters. Cromedome, hard head.

Masterforce. Metalhawk , Apex Prime

Victory, Starsaber, Laster, Dinoforce

Zone, Sonicboomer.

Return of Convoy, Starconvoy

G2. ???

Beast Wars. The whole Cast.

Beast Wars II. Lio convoy, Kid, Galvatron, Megastorm/Gigastorm, Starscream

Beast Wars Neo. Big convoy

Beast machines. Trust/Waspinator

Rid. Fire convoy, Skybite, Scorge.

Armada (micro legends). Convoy, Jetfire, Hotshot, highwire, Blurr, Megatron, Tidal wave.

Energon (Superlink). Jetfire, hotshot, Inferno, Megatron/Galvatron, Shockblast.

Cybertron (Galaxy Force). Galaxy Convoy, Undermine, Hotshot, Override, Scorge, leo bracker.

Movie. Ironhide

Animated. Optimus, Wasps, Megatron, Thundercracker, and jazz.

 

G1: Magnus and Shockwave by far

Headmasters: Fortress Max

Masterforce. God Ginrai

Victory: Victory Saber

Zone: the big cheese Dai Atlas

Return of Convoy: Star convoy

G2 Thunderclash Laser Prime

BW: Rat Trap or Waspinator.

BWII: Megastorm/Gigastorm,

BW Neo: Big convoy

Beast machines: Thrust/Waspinator

Rid: Magnus Scourge.

Armada: Tidal wave.

Energon: Galvatron Shockblast Omega

Cybertron: Megatron Primus

Movie:Optimus

Animated: All The Seekers and Omega