>>5671862Devastator has a Combiner Wars and Unite Warriors release, but they are budget toys and cut corners, but they're mostly G1 accurate and big. In the case of the Hasbro release some lack elbow articulation. In the realm of third party there were wars fought over combiners, plus upgrade kits for the CW release TFC Hercules was the first and does the tread arm look, Maketoys Giant diverges from the robot mode look but is dynamic though smaller despite its name, Generation Toy is very similar to giant but larger and focuses on vehicle mode detailing, Toyworld Contructor is mostly based around G1, is the largest, and has the best articulation for a combiner but to do this it relies on partsforming the combiner waist, head, and arms that are nothing but extra pieces that sit off to the side. Dx9 Hulkie is a pocket sized Devestator which is the most G1 accurate of all and doesn't partsform.
Pic related is Toyworlds holding up Giant. I personally went with Generation Toy and owned Herc and Giant at one point. You have a ton to pick from if you have the cash to drop.