Im sry but i think u are wrong on that one @Nyet.
Lets do a quick example with some idealized numbers to make the math prettier:
scenario 1: U have an r7 azrael bow with 20% s-dmg and 57% crit dmg, it turns out that u will deal ON AVERAGE 1385 Dmg. The calculation is: 900*1,2*2,57*0,18 + 900*1,2*0,82 = 1385. Meaning u boost ur dmg by 485 on average.
scenario 2: U have an r7 azrael bow with 20% s-dmg and 150 enhanced dmg, it turns out that u will deal ON AVERAGE 1486 Dmg. The calculation is (900+150)*1,2*2*0,18 + (900+150)*1,2*0,82 = 1486. Meaning u boost ur dmg by 586 on average, which is roughly 100 more.
I know that there is no 20% s-dmg, and that u have to factor in the defense of ur enemy, but the calculation is nicer with 20% and the defense is the same in both cases, so it doesnt matter. Also note that 57% crit is really good, most bows arent that great, so crit would be much worse on ur average crit bow, but because of that i used 150 enhanced, cuz thats also pretty good, so it kinda evens out in terms of greatness when it comes to the stat we wanna compare.
If u dont like absolut numbers, which i understand, the dmg increase is around 7,3% on every hit, which is a lot. Its the difference between a bow with 19% s-dmg and one with just 12%.
tl;dr: enhanced dmg is better