In theory, I'd be happy either way. Either do a Commander PMOP and Leader Apex Bomber, or just do a Titan combo pack. Or HasLab even, though I really think that shouldn't be necessary in this case. I think any of them has the possibility of getting us a really good figure. In theory...
In practice, we saw how Legends God Bomber turned out at the Leader price point. I would hope they could do a lot better now. But if we ultimately get a video from the design team talking about how they had to go to the Titan class or even a HasLab to make sure the full package is stable and cohesive, I won't be second guessing them.
Also, as much as I want to lean toward the Commander + Leader idea, I would point out that there are a TON of characters that I'd love to see done as Commanders. All the combiner torsos. PMOP. Optimal Optimus (and ideally a TM2 Megatron redo to match). BW2 Galvatron. Gigatron. Dai Atlas. Some of the Animated Decepticons. Maybe Thunderwing. Maybe Broadside. I'm sure I could come up with quite a few more with a bit of thought.
In contrast, I have a much harder time coming up with bots that would be a good fit as Titans, especially at the new size. God Ginrai and Omega Supreme to match SS86 Devastator are the main ones that jump to mind. Maybe a Big Powered combo pack. I'm having a hard time coming up with others that wouldn't be disappointingly small at the new size, or way too big at even the smaller Titan size. Given that we get both one Titan and one Commander each year, that factor makes me lean toward the Titan option just for assortment considerations.