Isn't one of the factors against the military-style 1 x 180 finals turn that there is no belly check (awareness of what is outside the turn) whereas on a civil 2 x 90 the base leg provides an opportunity to check long finals or even a base leg join from the dead side (I've seen it done)?
It is however very easy to fly (and teach).
Mixing of the 2 types is difficult at best - we have both types where I work
and don't mention UHF vs VHF
