BT has always had a lower latency network in my experience, minimal to zero jitter but the bandwidth of VM is really desirable.
BT is quite good for that these days - I notice a huge difference between VM fixed, 4G and my BT connections in terms of "snappiness" just in things like hitting "New Posts" on these forums. With obviously 4G being the worst but VM surprisingly noticeable on average different to BT.

