I think the problems with Nicehash were only with the D9.  I pointed one of my S11s at Nicehash for 1.5 hour and it was working.  However, the pool-side reported hashrate seemed lower.  In my mind, that sorta offset the convenience of being paid in bitcoin.

I have my S11s pointed at Luxor.  The list of pools for Siacoin is short, so you don't have a lot to pick from in reality

https://siastats.info/mining_pools

The advantage of SiaMining is that it's a PPS system, which means you accumulate siacoin for every minute they're mining, even when the pool doesn't hit a block.  The downside is the 3% fee.
Luxor is a PPLNS system, which means you only get paid when the pool hits a block.  So, you could go many hours with no payout at all, then get a large chunk payout when the pool hits a block.  Over time it should all even out statistically, and Luxor currently is 0% fee according to their website.
The other note about Luxor PPLNS is that there is a 24-hour ramp-up to prevent pool hopping, so your payouts in that first day will be less than usual as you build up your participation in the sharechain.