There is a search function at the top of the page, and I think there's a good thread somewhere comparing the PA28 and robin.
Whatever you learn in will have pros and cons. PA28 is very stable, easy to land and good for navigation, but has such a dosile stall it can teach bad habits, robin probably the opposite.
Never flown from any of the schools at Shoreham, but I would take a good look around each and see what fits. A posh club house isn't everything - try to take a look at the aircraft, see what their interior is like, how much nav kit they have. Ultimately, the actual learning bit is more down to how you get on with the instructor than anything, so any school could be perfect, but you want to see how it's all run.
The theory isn't that bad, there's 7 exams, all multiple guess, 75% to pass each one. You'll probably be presented with a stack of textbooks after your 1st lesson. The more time you spend reading them, the better you will understand the subject and the less money you will have to spend on flying lessons
