I had the same dilema, I had a overnight shft starting of site, so I basically had to catch 90% of LCD as Sprints was further Away and would make me late. Missed IDLES as well, Immediately after Glasto had to book tickets for IDLES, supported by SPRINTS, has i missed both - they were cracking in support although there setlist was in a strange order. Im actually randomly going to these two as my next two gigs.
Hopfully someone here was there so they can tell us all about it.
Go for a ticket in the resale and you still have a good few weeks before the refund deadline to make a final decision. Also a shorter one is a good idea. You could just go for the music days.