imo, stamina is less important then health. the slow time perk uses stamina, but you only have to tap it, holding it down while you nock the next arrow is kind of pointless...
If you have time to draw, it's no big deal.
But if you are trying to get something dead before you get fully detected, then slow time draw can be a big help.
(This doesn't work so well on dragons, though. Partly because of range issues. It seems like if you are within arrow range and it's daylight you need a good distraction if you are going to stay stealthed: even with the damage bonuses it's going to take a lot of stealthed arrows to injure a powerful dragon, so you are better off drawing normally.)