In my opinion Positive Grid offers some of the best sounding amp modelling/virtual guitar amp software available. Over the years I’ve been using ReValver, AmpliTube, Guitar Rig, Softube and a few more I don’t even remember the name of. I think that most of them have something good to offer and of course, guitar sound is a matter of personal taste. Up until now my main guitar software has been ReValver but I just think that Positive Grid sounds more the way I prefer. Right now I’m using BIAS Amp and BIAS Pedal for recording rhythm guitars and BIAS FX for the lead sounds. It’s amazing how much tweaking you can do with it. If you are looking for a virtual guitar amp I can highly recommend that you check them out!