@James *************
I pay a lot of attention to the speed and trajectory of change. Sure, Phnom Penh has some dumpy areas, and a dumpy past. But the pace of change is rapid, and that's fun to be around. As opposed to some places that are stagnant or declining.
Kampot is great, but a little too touristy for me. Ditto Siem Reap. And I do appreciate the amenities and infrastructure of a capital city on the way up.
For me, I appreciate frontier experience during economic boom.
Edit: I just spent a week exploring PP. Heading back tomorrow. Am very familiar with Siam Reap and Battambang. Kampot is high on my must-see list once I am settled in with retirement visa, condo and bank.