I like the Perko Seacocks, big round flange, 4 bolts, very rugged but very IMO expensive. You can get straight or 90 degree hose adapter or thread in a Tee or other fitting.
Down side is the $240 price tag. They are cheaper at sailnet but still $200.
PERKO SEACOCKS CAST BRONZE 9-0834008PLB Hose-1-1/2", Bolt Size-3/8" Shop.Sailnet.com - sailing resources, shopping, sail, blogs
Of course a really good backing block is needed for which ever seacock you use.
I did not use, but considered the Marelon seacocks. I think I might have used them if I was going to change the bolt pattern (they use 3 bolt) but there is just something about metal that I prefer.
Bonding is required on metal seacocks (all the good seacocks will come with bonding screw) if the hose being used has steel reinforcing in it or is conductive. If the hose is a plastic hose then no bonding is required. I think that is the recent ABYC standard.