Sorry I don't quite understand Q1.
Q2: I use both NetFront 3.0 and PIE on my Axim. I generally use NetFront but some sites only work with PIE, e.g. the pcpitstop site to measure Internet download speeds.
NetFront is also available on Sony Clie. Again, it works very well. Other than that Palm vs PPC debate is a can of worrms I will not open

I use both - mainly PPC but when I need a hi-res screen I use my Clie (nothing beats the Clie in this regard).
Q3: I think NetFront is the best standalone browser for the PPC and Palm. I stay away from subscription-based services like Thunderhawk, etc simply because I also use my PPC to access corporate intranet sites, etc and these browsers don't work there.