In reply to karl_w:
I had good experience of Martin Moran in Scotland years ago (ended up with 2 days on the hill with A Living Legend who was working for Martin to get his Guides logbook stamped or whatever - excellent, 1 day with Martin [dry sense of humour, very capable guy] and 2 days with a top-notch local guy). I would recommend checking him out. The Brenin has always been good & very professional in my experience over the years, I don't know about Glenmore Lodge personally as I've never been there, but I know other people who rate it highly.
One thing about going direct to an independent guide like Moran or others is that the experience can be IMHO, let's say, more personal and mellow than the Brenin which is a bigger operation. All these outfits should be operating to the same minimum standard, as they all hold the same types of qualifications, and indeed many of the same staff will work for the various providers at different times. So it's down to customer service, client care, and if it's someone's business and livelihood then that should be focussing their minds. A good guide/instructor should also try to let the clients have some input into destination, route etc, rather than do exactly what they did the week before. There's plenty of suppliers out there, you pay your money and take your choice.