Looking on where Microsoft is going with asp.NET vNext I would strongly encourage you to use MVC for any new development. Though asp.NET vNext is still in an early phase, it seems that the main effort will be put into improving MVC while web forms will be supported for backwards compability in some environments (but not all, like the new cloud optimized version). Therefore, going with MVC clearly reduces the risc of a rewrite within a few years.
I agree with Linus and there are also a lot more help and examples in MVC than in webforms even for EPiServer now.
There are a little barrier to get over to understand the filosofy of MVC but I think all of your developers will get over it and understand it in a short time.
We are not doing any webforms at all apart from maintenance of old sites and when looking back in a web form site after working a while with mvc you will wounder how you could stand working like that :-)
This blogpost from Scott Hanselmann is explaning a lot.. http://www.hanselman.com/blog/thefutureofnetontheserveraspnetvnextcontentandvideosfromteched2014.aspx
Agree with Linus but also worth mentioning that a website change from time to time and in 2-4 years you have probably built a new website, with probably vnext v2 :). Therefore I would still sugest you choose what ever you like. Also MVC and building complex datadriven websites tend to be troublesome.
There is also a Community Standup worh following on youtube: https://www.youtube.com/watch?v=NgbA2BxNweE&list=PL0M0zPgJ3HSftTAAHttA3JQU4vOjXFquF
My company is about to create a new website (not an upgrade project) with the latest EPiServer CMS (7.5?) and we are looking at what technical aproach to choose between WebForms and MVC.
We are two developers and both have been developing in EPiServer for many years and have good experience in WebForms.
One of us has two years experience from MVC, but not with EPiServer.
We know about MVC:s benefits with TDD, separation of concerns, code re-use and that we get better control of the HTML-code etc.
What would you recommend as the best choice between WebForms and MVC in a new EPiServer project? What are the pros and cons?
Best regards Kristian