Having used a pile of different ones over the years I've settled on the Opinel no.12 pruning saw w/ 5" blade. The locking ring really locks the whole thing up super positively (no chance of it coming apart and cutting oneself).

I'd absolutely go for the lightened Pocketboy if the locking mechanism is stout/positive. I like that weight!

While I've used blades larger than 5", I've never found I need more for backcountry fires, as long as you can out-think the chunk of wood.

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“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery