Properly executed, it should make no difference. Modern premium-grade optical glass suffers very little, nearly negligible absorption, and modern premium-grade coatings same comment regarding absorption, scatter, R/T inefficiency losses. The operative term here is premium-grade. Allan's comment above is consistent with my assertion.
PS: I've designed, built, and executed spectral throughput measurements on telescopes, prisms, windows, eyepieces, Star Diagonals, and complete systems... and found that the most consistent predictor of throughput performance is... cost. The very best are almost all outstandingly superior; the mid-grades include great performers but with some clunkers; the economy models are most often deficient... sometimes terribly-so. You most often get what you pay for; no cheap lunch. Tom
[Decades or more ago, this wasn't necessarily the case. Sophisticated MARC coatings were still in the developmental stages, only occasionally appearing in a few top premium gear. I was both a coating engineer/scientist and optical metrology specialist.]
Few related pictures showing measurement set-ups and eg results how such metrologies are done >>>
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