I know there's another potential list maker on the way, but for the sake of kicking this off:
10) BMB Dinobots

I had no interest in the POTP versions of these, but this crazy colour scheme absolutely won me over. Wish Hasbro did more weird stuff like this. Incredibly fun team.
9) TFM Motormaster

I was a bit late to the party with these. The alt modes on all of TFM's Stunticons are amazing and Motormaster, IMO, is the most impressive of the bunch

WFC Cog

Whoever had the idea to make Cog capable of splitting into weapons that can be used by everyone else in the line deserves a massive promotion
7) BMB Grimlock

Really liked the Studio Series version, but it wasn't quite the size I needed for my collection. This fixes that. And he looks bloody impressive on a shelf
6) Neoarts Black Lio Convoy

This guy is a work of art. Beautiful use of paint and diecast, and absolutely spoiled with accessories. As a bonus ShowZ even included a KO PE Ratbat.
5) TR Blot

Blot is love, Blot is life
4) WFC Sideswipe

He's like a mini MP12, but with the bonus of being a super playable deluxe figure
3) Thunder Manus

Looks like a Boss and has tonnes of playability
2) MP Dinobot

When MP Beast Wars became a thing I hoped they would finally be able to give Dinobot the figure he deserves. This went above and beyond that any expectations I had
1) Challenger

As soon as I saw this guy I knew I had to have him. Easily my most anticipated release of the year