p slots HELP!!!!

i need help
there r 2 sets of p slots i have the choice of buying
one set are 14" and have 9 Ps on the rim
and the other are 14" but has 8 Ps?
whats the differance??
and which 1s to pick??

the 8p's are rare the 9 slots could either be mk1's(7mm between P's) or mk2's(10mm iirc between p's)the 8 slots also have a more domed face and should come with metal pirelli stamped caps,the 9 slots you should be payin about 80 for good mk2s mibs up to 200 for mint og mk1's and up to or over double for 8slots in good nick

metal caps alone can go for over 200 quid

I have a set of 8ps with metal caps,super condition .Ill take ?400 for them.

8ps are the rarer of the two.  But how much they both for?