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thanks. If you had to do half of that route, ie one loop rather than two, in two days full MTBing, where would you choose?
platypus-
Of those, I'd do the top loop, but extend it to take in Nethy Bridge and Loch Garten - the woodland around there is beautiful, and you can easily navigate back onto the track shown. Just leave plenty of time to ride the valleys through the Cairngorms proper. I haven't ridden the two shown, but find in general you end up with a mix of boggy and and rocks/boulders. Find for walking - not easy to ride.
If you have a spare half day, there's also a track from just south of Aviemore (Burma Road?) that takes you over one of the hills and down to Carrbridge which is worth doing. The climbs a pig, but the route down to the other side and back to Aviemore (you can do some of it off-road) is wonderful. Not 'epic' but very picturesque.
LHL
I've done quite a lot of MTBing and walking around there. Any particular questions? Looking at the route, I'd expect to spend some time on foot - it can be pretty hard going on a bike once you get away from the main tracks. On the other hand the biggest climb just past Loch Morlich is pretty easy - so the rest can't be too terrible.
Be cautious of the weather. It can get pick up quicky.