Well I like Cliftons I only have the one a No5 but I have just bought a Veritas, Why? Well as said earlier Clifton do not have a huge range, but they are quality planes. The one I wanted/needed was not part of the Clifton range (shame).
The question of materials used in the manufacture is an interesting one, and wether they add to the tool is a questionable one, I like Tony am an engineer, and for me the proof of the material is in the use, does a LN plane better as it has a bronze cap.........tenuous i think, it may look better, which is what some people mean, and as beauty is in the eye of the beholder, its a very personal thing.
If you are a collector then you want your collection to look pretty and shiny, if you are a user you want the tool to perform, and it will do that if it has been polished or not.
It is a very personal thing, firstly you must decide wether the tool will do the job you want it too, then you must decide wether it will fit you, I have never liked the veritas rear totes with the upper strap as they do not fit my hand. My new veritas does not have that strap and does fit, I feel at one with it when I am using it and I think that is the most important part of the tool. LN's nice planes to use do not feel very comfortable in my hand, I do not know why.
Basically try all 3 and see what feels the best, because if a hand tool does not feel good in your hand then you will not be able to use it to your best. Also don't get put off by the shiny bits or the lack of them.
Bean