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Everyone's opinion will differ. I have ~7KH/sec and prefer to use a pool.
the problem with the only stratum capable pool for yacoin (yac.coinmine.pl) is: they currently control 80-90% of the hash rate.
Essentially if that pool operator went rogue, this would destroy Yacoin.
Look at the tantrum the bitcoin community made when one pool got close to 51%.
Maybe consider solo'ing to improve network health.
Christian
you could also use yacp.coinmine.pl if you were concerned about the monopoly (as I am as well)