Going back a bit, a lot of this kind of debate comes from many/most people not knowing why they are learning to fly.
IF you knew why you want to fly (e.g. aerobatics, going places, long range European touring, flying over Beachy Head on sunny Sundays only, etc) then you would go along to a school which will teach you in the appropriate type, and you won't waste much time afterwards converting to the eventual type.
Even better, buy the plane you want to fly and do the PPL in it. I wish I had bought the TB20 and did my PPL in it. Would have saved me £XXXX flying around in self fly hire junk heaps.
Unfortunately this is not the way the UK training system works - it tends to work around FTOs and the types they have parked outside. If one could have freelance instructors, customers would have more flexibility.