I can only comment on the PP700SA as i own one, but have messed around with the CP1 for a few mins.
I find the build quality of the PP to be moderate at best, as repeated teardown/rebuild of them will cause threads to strip,
so for me being a tinkerer they do fall short in the quality department, but then they are a very cheap PCP pistol.
My PP is in .22 and I cannot fault the accuracy however the regulator doesn't give much in the way of consistency when ran over a chrono.
I plan on installing a HUMA regulator in the PP as that will definitely improve the consistency, but that increases the value by another 90 quid.
I did find the CP1 accurate and at some point I will own one (just waiting on the right deal).
FX ImpactX, AirArms HFT500, 2xAirArms S200 MK3, Webley Omega, Weihrauch HW95, HW97K, HW98, HW99s, AirArms S200mk3, Gunpower Stealth, Weihrauch HW40pca, HW45 Black Star, Webley Alecto, Crosman 2240, Artemis pp700sa, Swiss Arms SA P1911, Walther CP88 competition, CP99