Hippofan flax, previously LWP wood pellets but I didn't like the bed much. Have used a chopped wheat straw/rape straw combined bedding and that was nice, but expensive, I don't like shavings and straw stinks! Although, back when straw was cheaper, I had huge beds with sawdust (25p a bag from the local fencing place, all white wood) underneath on top of rubber mats and an earth/hardcore floor and that worked out really well, even for a wet horse. I didn't rate rape straw on it's own and I've never tried miscanthus.
The best bedding system I ever used, was an enzyme bed. No mucking out for 16 months, just take the poo of the top and once a week add more enzyme powder and a thin layer of shavings. Ten minutes to do a bed, including filling up water buckets and putting in the hay. It was warm too and had a feel like a firmly sprung mattress. Horse loved it, but it was expensive to set up, so I had to abandon it.
