I always tend to lean towards my Kyser, I have a shubb but for live shows especially because I use my capo a lot and on different guitars it takes to long to adjust the tension to get it 100% right. I have always placed my Capo in the very middle of the fret as thats what I have seen many of my 'heroes'do and also I figured it kinda balanced the tension.....

On another side note here is a great tuning vid from the songwriting master Mr James Taylor....very interesting