I went from a TalkTalk Business connection with prioritised packets on their network to VIVID350 and have noticed absolutely no difference in any game I play competitive or otherwise, that includes competitive first person shooters, the things that would be most affected by latency related issues.
Your results are not indicative of the quality of the overall service for other people, the same applies to other people with positive experiences too. But if the issues were anywhere near as widespread and deep lying as some people try and make out the forums would be a lot noisier than they are.
Dream of cheese stop arguing bro there's loads of people having the same issues as him, I was when I was with virgin. Bt are just a better overall ISP, so is sky. Don't take my word for it, just research it
There are loads of people on every ISP having issues, you cannot just look up issues to confirm a theory that the ISP is nothing but issues. That's just confirmation bias.
If you go to the forums over at ispreview or Think Broadband you'll quite often see threads from people asking for advice on issues of their sync speeds dropping by double digits randomly or noise issues with VDSL connections (which affects BT, Sky, TalkTalk and any other ISP offering services over the Openreach network.)
No ISP is perfect, all ISPs have customers who face problems. If you have a VDSL connection and a DOCSIS connection and both are working properly you'll see no difference in gaming performance.
In the house we have PCs, PS4Pro, and an Xbox. Never have LAG, and no Dropped connections. But then again, I only use VM SH3 in modem mode, with my own router.
Myself and Step son, both can be on the same PC server on PUGB, and its works well. When I am on BF, I have seen my latency to be better or as good as anyone else on the sever.
The PS4Pro and Xbox, also have no dropped connections.
I work in IT, and so hear so many of our users complain about there BT connections. So I am glad I don't have BT. Funny that 8 out of 10 in our IT dept. have VM. All on different speeds. All works.
PS Don't let the VM door hit you on the way out.
-- Red (VM SH2 AC Beta tester) Running on 350Mb VM service with SH3 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech. My advice is at your own risk.