/ Recommend a first grade 3 in northern corries
They're all alright from memory, so it depends on conditions on the day. Broken Gully is only really 1 pitch at the start and is good if it's icy. Milky Way is probably the easiest one I've done there and Invernookie is the best grade 3 I've done there, but technically harder.
Hidden Chimney is probably the one to go for if conditions are good, although I did it last year when there was little snow about and found it quite difficult in places. I think the protection was generally pretty good though. Similarly, did Invernookie recently in thin conditions (powder and frozen turf) and it was definitely nearer IV than III. It would be a cracking route with good neve, although protection was quite hard to find in places. There are some superb routes in Sneachda of all grades so I'm sure you'll have a great time.
Iron Butterfly in Lochain is very good, and much less likely to have queues than some other routes mentioned. Usually safe approach to far left of corrie. I can't comment on what the gear is like though since I've only soloed it!
Ewen Buttress is a nice route. Pick the right conditions and you'll get a great line up the buttress with lots of photogenic opportunity.
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