Single Fin Comparisons Help

Have been looking at fins for a mid-length (7'6ish). While I'll definitely get a 4A, I was wondering are there any (if at all?) substantive differences between a Christenson Volan PG and a Channel Islands Spicy Single Fin? By that I mean, are they both fairly similar to a wide base flex like the 4A, or narrower base like a 4C? The PG sort of looks like a 4C and the CI Spicy write ups make comparisons to Liddle L-Flex and Yater Classic, but I'm wary of corp-o promos. Was just looking for some variety, otherwise I might just opt for different sized 4As. Thanks! 
