Question on PE mudguards

The simple answer is it depends...both can do the job. It all comes down to three factors: 1) the design of the PE in terms of number of parts, assembly, and bends/joins 2) the attachment points for the mudflaps to the actual vehicle and 3) how durable/fragile they are. This of course assumes that you are equally comfortable with CA and soldering...if that's not the case then that becomes factor #4.

When PEs are involved, joining it to other parts will require CA but when attaching it to other PE parts you can either solder them or cement them with CA. I personally  I use CA because it is easier to handle than using a soldering gun specially on tiny parts.

Gator's Grip Hobby Glue

second the gators grip for anything you may not get in the right place first time.

I have Garors Grip and have used it on PE before, it does work on certain parts. I just have never build any PS mudguards but I'll give it a try this week.