SIEGE Megatron is alright, but the fact that his neck plate doesn't tab in makes him a bit iffy. And his deco is a bit bland; I really think foregoing some of the battle damage to use the paint budget on giving him a silver chest would have helped a lot. Still, I find him more appealing than Classics Megatron. He doesn't have the bulky wings, I like his proportions better overall, and his arm cannon is proportioned for his robot mode. People say TR Galvatron has an oversize cannon, but it's got nothing on Classics Megs.
Classics Megs, I don't think he belongs on a "Best Megatron toys" list any more than MP-05 does. And certainly not at the top. At the time of this list being made, I think the Unicron Trilogy Megatrons, the original Beast Wars Ultra-class Megatron, 10th-anniversary Beast Wars Megatron, and
Robot Masters Beast Wars Megatron were all more worthy of inclusion. And since this list was made we've had Titans Return Megatron (or was he out at the time?), the Studio Series Megatrons, MP-36 Megatron, MPM-08 Megatron... I'm pretty sure Classics Megs can kiss his spot goodbye.
Still the best Megatron for me. I like how he looks in all three modes, I like the "Trypticon spiced with Unicron's orange" color scheme, I like his weapons, and unlike Kanrabat I think his arms are just fine. The only problem I have with him is balancing him when combined with Nemesis Breaker in Dark Claw Mode.