I think this is worth clarifying a bit. You don't want any CE2 for the 5 ml MAP. You want E2-XL for the 5 ml MAP. CE2's are clearomizers (the C must stand for clear, I guess) and E2's are steel tube. The XL length E2 is the correct one for the 5 and 12 ml MAP tanks.
As to best? I prefer the R4 thick wicks and I usually use 2.4 ohm for my 3.2v to 3.7v batteries. I do have a
juice that just seems to taste and vape better with a 2.8 ohm, though. - Some people prefer the bowties, but I've had much better luck with the thick wicks. My most recent purchases of E2-XL's have come from madvapes and COV. One of the three boxes from COV were bowties and all three boxes from madvapes were thick wicks.