Tricky one for me as I have had a few issues with Vallejo
Model air. Don't get me wrong, they spray very well and are great quality, handy that you don't have to thin them either so it is quick and consistent.
My problem with them is that the names of the colours are weird. If you look at my models of the RAF Mustang and the
Revell Spitfire, the dark green on the upper camo is actually Vallejo
model air German Uniform Green or the Field grey, I cannot remember which. Whatever, neither of them were any use for painting figures. Don't get me wrong, not all of them have weird names which do not match the colour, but there are a few. The Barley grey is superb and I have used it to spray my Eurofighter and prime at least four other 1:48 kits with still a tiny bit left.
Add to that the Xtracylix which are just superb in both quality and price, I am not sure if another make of the same colours will be appropriate (remember the Lifecolour John). Unless you are planing to drop the Xtracrylix, in which case I would happily use Vallejo so long as I knew it was the right shade.