In almost all cases I like the Meguiar's stuff better. One instance where I don't like the Meguiar's stuff better is their detailing clay. Too soft, tends to rub off on the car no matter how much spray lube you have on there. You may want to go the Mother's route there. For the rest of the exterior stuff, you can't go wrong with Meguiar's. Opinions get a bit more divided when it comes to leather, MB TEX, plastic, etc but for most things exterior/paint related Meguiar's is tough to beat. Give both a try and let us know which works best for you.

Hope this helps....Lee