I have not tried both of those though I have tried the VM Fretless and a fretted SR300. I don't think either one wins hands down over the other for quality or sound. Try them both and buy the one that appeals the most to you. They are both very good basses. I'm really looking at 5 strings so I played the VM Fretless a few times for grins and I played the SR300 because it was the closest the shop had to an SR305. As a result I did not make careful mental note of the difference I am about to point out so it may not be true of the four string basses, someone else may be able to confirm or you can check it out yourself. When it comes to the five string models Fender/Squier uses a wider string spacing than Ibanez. Some people like one or the other, my conundrum is that my left hand likes the narrow Ibanez spacing better, my right the wider Fender spacing. Like I say the four string models may both use the Fender standard spacing so it is just something to look for, not gospel.
Ken