If you do[ not want to piggyback then you go can do all the exams, all the flight training and the flight test - just as if you had no license.
If you have a plan to fly in the US and build rstings to a CFI or commercial it makes sense - your prior traing will let you get to PPL quicker.
If you want to be able to fly US reg machines somewhere that you current license is no usable - then the piggyback makes sense as it it a simple case of getting the CAA letter snd filling out forms - the FAA PPL (H) is issued, to be valid your original license must be valid be in flight review and you must have a current medical for that license - then you MUST hzve a current FAA flight review.
Sounds complicated but it isn't.
There is only one other reason to get a non piggyback PPL that is where one can get an FAA Class 3 but not a JAA Class 2.
Also the piggyback isaz one shot deal get an airplane piggyback and one cannot then get a PPL helicopter (or other rating).
Good luck with it though
