Personally I prefer to play the long game, in response to this expected fatigue-inducing season.
Playing second stringers, rotate well early so hopefully we get many players back to their best forms a.s.a.p. from real games since our trainings are unreliable. Would also contribute to competition of places which helps. It's better on the long run.
Plus, don't see why we should be so scared of Istanbul, just as we shouldn't previously vs RBL which oddly many fans do. If it's vs PSG again, then definitely bring out all your best guns. Against the weaker actually shit teams though why bother too much? We need to consider improving our shit PL form as well. Imo PL is more important than CL to be honest.