I've had both. It just depends on what you're in it for. If, like others have mentioned, you get off on giving others pleasure then you're probably going to prefer the real thing. If you get off on the stimulation from the act and are focusing on your own pleasure, you probably prefer getting pegged.

This, like anything sexual, has a ton of exceptions that prove the rule. There's toys women can use whilst pegging that fit into the vagina and vibrate internally or against the clit so that they actually do get physical pleasure from the act. Some women enjoy and get pleasure from the act itself whether or not they reach orgasm during the same way a lot of men thoroughly enjoy fisting or toying a woman even if they don't cum in the process. Some men that top others have a very hard time reaching orgasm during penetrative sex and won't orgasm at all during.

Basically, it is what you make it. I've been fucked before and while it was certainly a good time I vastly prefer toys, although I'm fairly certain that's because I'm not emotionally attracted to men. I feel like if that attraction was there I'd prefer the real thing for various reasons. But it just isn't there for me, and believe me, I tried to find it.