Took me long enough to finally add TFP's Predaking, didn't it?
This is a pretty interesting match-up. It's fairly obvious that a lot of Prime Predaking's design was at least partially inspired by Beast Wars Megatron's Transmetal 2 form. Both are very tough robots that transform into fire-breathing dragons.
Here's Megatron in his first real fight in Transmetal 2 form:
Here's Predaking fighting in dragon form for the first time:
With Predaking scaled down to this Megatron's size, he's still likely a lot stronger and durable physically in robot form. What's more, Predaking at least doubles his size in dragon form and his durability increases even further .
The vid of Predaking that Venom posted in the previous match-up didn't really do that much justice to what Predaking's robot form is really capable of.
Keep in mind that Predaking is around 50 feet tall in TFP. With him scaled down to BW Megs's size, he won't be nearly that strong, but he will likely be even stronger proportionately with the pull of gravity effecting him less at a smaller size. Not to mention that his dragon form will still be much bigger than Megatron's.
Megatron still has one thing that might affect Predaking: his ice breath. Transformers in TFP are more vulnerable to cold than in other mediums. Predaking has a habit of trying to tank attacks, so Megatron may try to freeze Predaking as he almost mindlessly charges forward. If Megatron tries to go toe-to-toe, though, he likely gets torn apart.