I had a Bluebird with IFS and an older one without. Current coach does not. The IFS coach I had was a pain in the ass--alignment. Since my current coach is a 40 the IFS is a non issue regarding the turning radius. IFS would neither a deal breaker or maker for me.

For the way I use a coach solid axle is fine with me. Less moving parts, the better.

I don't think I can tell the difference in terms of the ride.