I've never had radio stability issues on my Mogul, so I can't talk about that, but BT A2DP worked on the limited occasions I've used it.
And any specs I've found say the Touch has a 200mhz processor. The Mogul's is 400mhz. Plus the Touch has a smaller capacity battery.
Sources:
http://www.htc.com/product/03-product_htctouch.htm
http://www.america.htc.com/products/...res-specs.html