I only use Panasonic PQ (professional quality)
I buy 80% 63min tapes $2.49
and 20% 83min tapes $6.89
from B and H.
The 63 minute tapes are way cheaper, but if it is a 2 hour set, I would prefer to have one tape flip. If I am running 2 cams, I will always go with the 63minute tapes.