What do you define as quality ? Personally I find a broader background knowledge a better quality that I don't find in the FAA-system. I can't say it makes me a better/safer pilot because I don't know that. The EASA-ppl/IR and the FAA-ppl/IR are not the same / have different qualities. Pick the ones that suit you most. The outcome should be the same: we move in the same airspace and we all know what we are talking about.
I can't imagine studying the IR(A) in two weeks. But honestly I can't even imagine doing the basic PPL theory in that timeframe...