Here's my 5 faves (I'm a movie collector so that's why they're all movie figs)
5. TLK Voyager Nitro Zeus
4. HFTD Recon Ironhide
3. Tie between DOTM Deluxe Jolt and DOTM Deluxe Sideswipe
2. TFP Deluxe Soundwave
1. Tie between ROTF Leader Optimus and HFTD Leader Starscream,

 

Classics Hound (not CW).
Classics deluxe Bumblebee/Cliffjumper.

 

I got the classics bee in a mixed lot, I have to admit it’s very impressive, especially with the seat kneepads!

I’m always messing with generations springer/sandstorm.
I also rate highly the original seekers as they were my childhood, lost fists and all!
Finally the controversy courting mp Tracks! He always draws attention.

 

Unpopular Opinion: Thrilling 30 Deluxe Bumblebee (fav Bumblebee design)
Kind of Popular Opinion: Classics Optimus Prime. There is no better representation of a G1ish Optimus Prime for regular collectors than this guy.

 

In no particular order:
TR Triggerhappy
Such a fun transformation. Can't recommend Triggerhappy enough.
PRID Vehicon
Most of his vehicle mode folds away into his calves in an intuitive manner, it's like magic!
AOE Evasion Mode Optimus Prime
The most slavishly G1-centric Alt-mode in the line somehow doesn't suck.
TR Fortress Maximus
What a great retool of the T30 Metroplex mold, my only complaint is Cerebros's sound gimmickry not being great, but I don't miss hearing it go off.
Universe Mirage
A fun conversion scheme and easily one of the most flexible robots I miss having.
Animated lockdown
Goes from a Deluxe-size spiky muscle car to a Leader-Size robot and nobody is any the wise.

 

TR Blurr
AOE Scorn
AOE Evasion Prime
Prime Breakdown

Off the top of my head.

 

Off the top of my head, in no particular order:
TR Triggerhappy
T30 Springer
Armada Tidal Wave
RID01 Fire Convoy
TR Sky Shadow

EDIT: Can't believe I forgot RID01 Wedge! He's a longtime favorite of mine, and one of my first Transformers.

 

Universe cyclonus combiner wars optimus prime combiner wars onslaught

 

From Classics through Generations, including Combiner Wars and Titans Return -

Autobots:



Decepticons:

 

Classics Seekers, TR Triggerhappy, TR Nightbeat.

 

I really like AoE Bumblebee and the Classics Seekers.

 

aoe bumblebee
rts lugnut
dotm que
tlk megatron
classics megatron
aoe snarl
hftd starscream
rts legion megatron
classics bumblebee
tr blitzwing

couldn't choose just five so i went with my top 10. engineering is a huge factor to me and all of these toys have really cool transformations with great results in all modes imo

 

Super Fire Convoy
G1 Shockwave
Cybertron Primus
G1 Fort Max
Generations Metroplex

That's some of my favorites (in no order).

 

I don't think I can pick an absolute favourite, but I will say that I've never gotten sick of transforming G1 Slapdash, despite having him since the 80's. So unique with the folding undercarriage, and a spot to put all the extra parts in both modes. Including (in vehicle mode) sticking the standard engine up the rear when Lube is doing his thing. Oh wait, that didn't sound good...

 

Not including 3rd party TFs a few of my favourites include:
T30 Springer.
UW Nosecone.
TR Topspin and Twintwist.
LG Leo Prime/TR Alpha Trion.
RTS Jazz.
LG Super Ginrai.
T30/TR Cosmos.
MP Optimus Primal.
MP Cheetor.

 

I really thought they could have converted that into a Prowl/Bluestreak/Smokescreen mold.

 

Prime Vehicon
Prime Soundwave
Prime Megatron
G1 Optimus Prime

 

Prime RID Vehicon is tops for me.

 

OK. I will accept all forms of mockery. I like the MP-11 mold, it makes me happy. There, i've said it.

 

T30 Springer
TFP Wheeljack
T30 Armada Starscream
TR Triggerhappy
TR Sixshot
CW Fireflight
CW Rook
Gotta get the first three again though.