Only thing I noticed was it was quite easy to miss a turn on the Wall climb – about 2/3rds of the way up, there’s a fireroad fork with no waymarker – go round left and up rather than off to the right and level, the waymarker is a little further up!
I would echo Brassneck’s comment. The portions are effing huge at Glycorrwg. I’d probably start there, as the Whites climb is more of an interesting challenge which it’s quite hard to rise to after approaching 2500 ft of climbing on the way over (and with a bellyful of beans and tea). Wall climb was much more straightforward and uninteresting.