which is best pool for mining monero?
Dwarfpool.
I wonder why so categorically?
Likewise. I mean it depends on are where you are. Pinging Dwarf vs. Monerohash for me is longer and Dwarf charges 2% instead of 1.6% so guess where I am?
Monerohash is TINY compared to dwarfpool. Dwarfpool has a proven track record for years to be trust worthy and has ~30% of the XMR network. That means frequent luck, payments and their functionality is solid. But by all means, don't let logic stand in the way of choosing an inferior pool for 0.4% (it's actually far more in the favor of dwarfpool due to their size)