I had the good fortune to play both these courses this week (tragically a camera malfunction prevented me taking pics despite wonderful weather).
My sense is that Trevose is generally regarded as the poor relation of the two - and even if its own right, not that well regarded by some on this site.
Certainly I would agree that St Enodoc is the superior course - it is such an exceptional piece of land with many great holes. Indeed, playing it alone at 7am on a peerless day, I can honestly say that I doubt I have ever enjoyed golf more - even if my golf was a bit ropey!
Having said that, if you can't enjoy a round at Trevose, then your intellect has definitely triumphed over your soul. Especially - Sean! - at 35 pounds after 3.30pm. While Trevose lacks some of the exceptional terrain that makes St Enodoc a stand-out course, it remains a great property - when you stand on the top tee of the 11th hole, you can see the entire course (maybe that is one common feature with Muirfield, another Colt links).
Played into the prevailing wind I suspect that the 4th and the 5th at Trevose are tougher than any holes at St Enodoc, bar the eccentric 10th. And the 4th is a great hole - a testing dog-leg par four with a blind approach to a green with the beach and the sea right behind it. Other holes I enjoyed include the one-shotters - 3, 8, 11 and 16 - a mixed and challenging set, 12, 14, 15 and 17. I thought the greens were quite challenging - very firm and difficult to get your ball close.
I think one of the criticisms of the course was that it was too open - something they have sought to address by adding a lot of new bunkers (on most holes you can tell there are 1-2 new ones). I don't know enough about what went before to judge the success of the changes.
I think there have also been some changes at St Enodoc - you could tell that the 16th green was new and different - stands out a bit like some of Donald Steel's work at Hoylake.
On the way down I played at Yelverton in Dartmoor - I will post some pics soon. I think we should have a GCA event some time that takes in these three courses.
[A note re St Enodoc - Having had my 10 ft par putt slip past the hole on the 10th at St Enodoc, I am perhaps not as militant re the hole as before. It is still a bit strange to play a hole that forces you to play 220 plus 230 - and there isn't really another option - to get to the green, but it is possible. But for the originality of the hole, and the church, and the wonderful mound/hill behind it - with a wonderful bench on it - to see all this at 8.30am on a gorgeous day, is to forgive!]