I realise I may get a slightly biased view here but still seemed like a good place to ask

I'm basically looking to buy a L3H2 second hand van for removals/courier work and just wanted to run my thinking past people who knew a lot more about them. I've narrowed it down to spending around 12k + vat (I'll be financing), from a reputable dealer who offer some kind of warranty and/or RAC check, and looking at vans 2017/18, ply lined, ulez compliant, 70,000 - 90,000 miles. With fairly decent tidy bodywork but don't mind the odd ding.
So it's really down to - Ford Transit, Citron Relay, Renault Masters or Vauxhall Movano. I understand that the Relay and Masters are essentially the same van just with a different badge? And that you pay a little extra for a Ford.
I really like the Transits having driven a few but I'm just wondering whether it's worth paying the bit extra, if you get anything more for that such as reliability or cost of parts, servicing etc or whether it's just the name?
So was just wondering what people thought really, if I've thought this through properly or missed anything glaring? It's a fairly big purchase so really looking to get this right and hoping to get 50,000 miles out of it without too much outlay and possibly closer to 100,000 fingers crossed.
Any advice and wisdom much appreciated...