Givben that the aim is to acquire generic pilot skills rather than to learn to fly a particular type, I would go for the Tiger Moth. I'm not saying that the Tiger Moth is necessarily the ideal ab initio trainer compared to, say, a Chipmunk or a Cub, but think that it may be closer to the ideal than the more commonly available tourer/trainers. Adding to what MLS said, and without knocking Cessna pilots, a well trained Tiger Moth PPL would probably be able to check out on a rental Cessna more quickly than a well trained Cessna PPL could check out on a Tiger Moth.