Have a good read of the buyers guide at the top of this forum in the M3W Owners Resources section, it will tell you most of what you need to know. You should be aware that some Brooklands M3W's were registered in 2014 but built in 2013 and don't have all the post 2014 upgrades, well worth checking closely. The Brooklands specific exhaust had a bad time initially with most (all?) of them cracking. This was finally rectified by Morgan after several "fixes". You should check that the Brooklands exhaust and mounts are of the latest specification, lots of info on this forum and the easiest way to find it is via Google rather than the website search.

In the long run the Brooklands could be the better bet as an investment but a well optioned and maintained 2017 car will be good as well.