Despite my complaint (above) about the electrics, I have to agree it was a good aircraft for getting the CSU and retractable endorsements.
But when I had my first electrical failure I was bloody glad my instructor had made me hand-pump the gear down during training, and was consequently not so worried about it when I had to do it for real.
As for whether it would be better to do the CPL training on the Cutlass or the Arrow - it's a long time since I've flown either but I suspect the Arrow is a more comfortable and quieter aircraft.