For the small(ish) difference in training costs, I would go for the JAR PPL unless you are absolutely sure you will never want to progress on to night/IMC/Multi/whatever. Having got the licence, you can then choose from a wider range of aircraft, and fairly easily fly microlights if you so wish.
it cost double per hour to train in a spam can rather than a "Eurostar" or other 3 axis microlight