I use trackpad on MBP, and a Microsoft Basic mouse on both my iMac, and work Dell laptop.
I cannot stand PC trackpads. They're all so twitchy. I can't hover my finger over the pad without it clicking, or jostling the cursor around. I have the Dell setup to disable the trackpad when a mouse is connected. With a MBP, I've never had a problem.
As for the "Is the Magic Mouse any good" question. I tried to get used to it for about a year. I just couldn't.
First, like PC trackpads, the touch was too sensitive. When moving between keyboard to mouse it would decide I'd done some sort of gesture and scroll, assume I meant to go "back", or some other nonsense. No matter how steady I'd try to grab it, or how "all at once" I tried to be, I'd trigger something. Infuriating. They really should have had some sort of delay on accepting gestures when detecting you're just grabbing the mouse.
Second, Mojang and Google Maps both refused to interpret the scroll gestures correctly. I couldn't easily change inventory slots in Minecraft (without relying on the keyboard), and Google would just zoom to as far in or as far out as possible at the slightest use of the scroll action. Often accidental input ended up wasting any mapping effort I tried. Perhaps Google was trying to hurt Apple's brand, but I really just hurt my opinion of Google... the rest of the web dealt with scrolling just fine.
Third, and what did hurt my opinion of Apple though, was that the mouse was awful finicky about batteries being the exact diameter they preferred. I had the first rev mouse that used actual batteries. I figured Eneloops were perfect, as they keep charge when not used for a long time... but no. The batteries didn't sit quite aligned with where Apple wanted them, and would just not work half the time. Wrapping them in a sheet or two of paper to increase their diameter enough to made them work. AA (or AAA, I don't remember) connectors shouldn't have so little tolerance. The next gen mouse with the built in battery with the charging port on the bottom instead of the back like every corded mouse ever... I just don't understand. Sure it charges quickly, but something you just need to get something done *now*. Whoever designed that is probably the same person that designed the Apple Pencil v1 charging by sticking out the bottom of your iPad. Colossally bad user hostile designs, IMO.