Don't know, I started doing everything at 48KHz recently.

It might make a small difference, but if you can't hear the difference between the 44.1 and 48kHz versions of your master on some good monitors, i doubt anyone is going to be able to tell in the club.

There's definitely a significant improvement from 44.1kHz to 96kHz. Although whether that's because the processing in plugins and so on produces less audible artifacts and maybe you wouldn't notice a 44.1kHz if it had been mixed at 96k I dunno, never tried it.

But I've run the virus plugin on protools at 96kHz and it sounds nicer than it running at 44.1k ... wonder what freqency the hardware version runs at internally...