Hi furofthedog. I've got the Champion straight axle. I haven't ridden on the independent suspension myself, but I do understand it is a "smoother" ride. However, cornering with the straight axle is wonderful. For me, that made my choice and I have no regrets. I don't find the ride particularly rough, and I would happily go with the same decision again.
You are going to find, however, that doesn't mean I'm right or wrong. Both are wonderful options, and definitely it comes down to personal preference. Get all the opinions, and decide which pros/cons matter most to you and go with it.
Keep us posted!