Hi Jim,
In my experience, with stereo pairs the aligning and mesh quality gets better, at the moment my rig i a bit chaotic, a mixture of stereo pairs, landscape and portrait, 50mm, 35mm and 24mm, Canon 600d and Canon1100d... the amazing fact is that its just working fine THANK YOU AGISOFT !!! its always some sort of magic I dont have (luckily) to understand...
Exhale,
I am only working with the 18mm-55mm lenses, for my purpose its good enough, again I have only limited space so flexibility is a must for me. Definetely a fixed lense equipment delivers better quality, so if you have enough space (and cameras) I would go for that...
regards Andreas