I've done both albeit on older rides. I used the AAW on a '40 and it was perfect- wires were all marked about every foot, plenty of length, very nice fuse block that was user friendly and could be added to easily. The Painless I used on a '31, and while I really don't have any major complaints about it other than the fuses, I'd probably go with the AAW on my next one. I can't swear to it, but I think the AAW was slightly less expensive as compared to Painless and a few other brands (at least for my application anyway). During my '40 build, the Summit Racing brand column that I'd installed turned out to be a total POS- it fell apart before I'd even started the car! I'd already crimped the wiring harness with the proper connections to that column, and didn't want to butt splice it all back together on the replacement. When I called AAW I explained what happened and asked about a ordering a second wiring plug- they said no problem, then actually sent me a complete new column harness at no charge! Since I didn't buy the kit from them in the first place (and told them that), I'm somewhat biased to buy from them again!
Did you see the size of that chicken?! -Dirty Steve