between the two, id go kicker. i used to have the pioneers a while back, they buzz and rattle too much
as for other suggestions i can give you, 100$ can be a tough price but there are a few decent subs out there for the price i think
maybe the kenwood tornado sub, though ive never heard one i was told they were decent for the price, same thing with bazooka, but again, never heard them. also, for about 75 bucks you could get an infinity reference, which i like for the price, its a pretty musical sub. i think kicker and infinity are the good options for under 100$.
now wait for all the people here smarter than me to come along and give you better advice. :p