I've ridden my friends Byerly 142 alot. I love that board!! It has alot of pop and smooth landings. I don't know much about the parks 143 but I had a parks 133 (for some odd reason) and the landings were hard.....but I'm sure thats because the board was so small. I'm going with bigger boards from now on and I'm 5'11 165. I'd say go with the Byerly but demo them first..good luck
Yeah its probably a lil bit slower, but you're gonna get more pop with the Byerly. Different people will give you different opinions but thats just mine. The Byerly isn't a SLOW board it's just not quite as fast as the Parks but your gonna make up for that with the pop.
could you feel the difference in the size. I have always rode a 140 or smaller, and I am 200lbs now and want a bigger board. but is a 143 gonna be more beneficial for me, or is there no real difference in the sizes