I think her using a toy is better,
Due to fact that she's naughty enough to even own one. It's
Nice to see what toys she's into, and what ones really get her off.

Either depending on the woman herself. I like hip movements and thrusts as opposed to her being mostly passive. Heavy breathing and moaning is always good but screaming is not for me.

Seiing her use her hands is more personal in my opinion,and when she is doing it i also like seeing her taste her fingers or give me a taste.

I don't have any preference if a woman masterbates with her hands or toys, both ways are incredibly hot to watch. If we watch close enough we can learn about her sometimes. I learned that although my wife didn't used to like her asshole touched during sex she would finger it slightly when she came from her Hitachi. Now if I stand beside the bed and fuck her slow while her Hitachi vibrates her clit when she's ready to cum I will slip a finger or my cock about an inch in her ass and she squirts all over both of us, its so fuckin hot! Since then she likes ass play. Sometimes we masterbate beside each other and sometimes we fuck each other with dildos or take turns with vibrators making the other cum. I masterbate with toys a lot too. Toys are great but getting back to your original question, I have no preference. Its just so fuckin hot to watch a woman masterbate, the concentration, the body movements, the spasms, the facial expression as she orgasms! Its so beautiful to watch. So ladies, just keep masterbating and we will keep watching.

My wife wont masturbate but I get her off with a vibrator on her clit and then insert a big dildo in her cunt. She always culms 4 or 5 times