I have gone back and forth on this. Having played both before, I think I would have a good idea which course I preferred to play, and would choose accordingly, even if one was quite saturated. For example, I would choose a Loch Lomond (a Doak 7 I believe) over a Crail, even though the latter is likely to play much firmer and faster. However, I can see some instances where I would chose a firm and fast option over a saturated one mainly because I personally like the course better.
That said, if I had never seen either course before, it would be tough to pass up an 8. Those opportunities don't come around too often.