I think what Dave was saying was the OP will not get any XF support here because this is a vBulletin forum.

I will wait for the answer from the OP but I would share a part as my forum is getting traffic from mobile devices

https://vborg.vbsupport.ru/external/2017/01/1.jpg

With this amount we also should consider to have a better vB style which runs as well on desktop, mobile or tablet.

Of course but though using vB or xF, then it has same support on each community.

XF is nice and XF2 is coming "soon" and is even better. XF are showing it off on their forums.

But the reason I went with vbulletin, beyond the fact my favourite forums have always used it, is that I posted a series of questions to different software companies' pre-sales forums a few days ago. Vbulletin answered, the others didn't...

If they can't be bothered to even answer basic questions, I can't be bothered to hand over my hard earned dosh. Plus, the obvious fact that if something goes wrong, how will their support be?

I made my decision based on that....what you do is up to you. Now, I just need someone to code me some XF like mods.:D

I can't help but think this was a typo, but maybe you do like vb5 on mobile.. I don't and I don't think my customers would agree that it's satisfactory.

Check out https://www.vbulletin.com/forum/ on your phone, then check out https://xenforo.com/community/

It's a night and day comparison to me, vbulletin 5 may actually work on mobile finally but they are still years behind the standards.
I'd really really think hard about suggesting vb5 as a mobile friendly choice over the competition