I just pulled the number 60 out of thin air. If 30 is better, then go with that.
I've never owned a hollow ground blade before. That is one of the major selling points for me. I've been wanting to try one. It is also VG-10 and a Seki back lock, both of which I really like. It's kind of a no-brainer when I think about it.
I find myself in the same boat. I hope you enjoy the P4LW as much as I do, and you enjoy the Endela as much as Wartstein.
SPY-27 is their signature steel, and the Seki knives are some of their most iconic knives. I would think that the two will converge at some point in the future. When? I have no idea, but I don't think it will be soon.