I'm also curious about the change. I'm a Logic Pro X user, but I was never on Windows. Switching DAWs is challenging, especially from something as unconventional as FL Studio, but switching computers and OS is another level of transition entirely.
Logic Pro X 10.1 (Jan 2015) includes a new feature called Smart Quantize. You should check that out. It does an incredible job of making performances feel tight, but without destroying things like dotted/triplet notes or 'smears' (sliding your hand across keys) another types of performances.
Do you work back and forth? or start and finish in one app? If you work back and forth, what are you using each app for? What are the strengths you see in each app?
Been using Acid for years but made a change to Ableton cause I feel I needed it. Can't drop Acid though, so will occasionally sample using it. Also use Acid for my vocal/instrument recording as I feel the raw audio processing is just amazing for me in Acid