Orianna support: situationally the better Janna?

of course, Orianna cant cockblock enemy engages like Janna does. And yet, their utility is actually not too different from each other. They both provide speed boosts, slows, shields(+stat boost), and knock ups. There are things Orianna does Janna's job way better. Maybe im heavily biased because i recently tried to learn Ori support. What do you guys think?

shield . . . . . . . . . . . . . . . . . . . . . . . . v s .. . . . . . . . Shield amount: . . they have same base amount at all ranks CD: . . . . . . . . . . . 10sec . . . . . . . . . . . . . . . . . . . . .9sec duration: . . . . . . .4sec . . . . . . . . . . . . . . . . . . . . . .5sec shielding range: . 800 units . . . . . . . . . . . . . . . . .1100 units additional stats: . AD . . . . . . . . . . . . . . . . . . . . . . armor&MR stats wear off when shield wears off: Yes . . . . . . . . . . . . . . . . . . . . . . . .No

of course, 's shield doesnt insta-cast like 's unless the ball is already on that ally. But i don't think that alone is enough to dismiss all the advantages in shield chart above as useless either.

movement speed modifier tried to put it in a chart format but rly difficult cuz since they work very differently. 's speed boost for allies (passive) works only when they move toward her. Constant CD less 8% speed modifier 's slow (W) works only on 1 enemy. Usable at 600 units away at max. 's speed boost (W) for allies can work regardless of where they are heading, making her the better chasing utility champ. Usable at up to 1100 units away by shielding. Slightly higher if ball on ally beforehand. Decaying 20%/25%/30%/35%/40% speed modifier that lasts 2sec And can also slow multiple enemies. Usable at around 700~800 range usally, and situationally at max, up to 2x of W range.

auto attacks . . . . . . . . . . . . . . . . . . . . . . . . v s .. . . . . . . . aa range: . . . . . . .475 . . . . . . . . . . . . . . . . . . . . . . .525 aa modifier_: (E)--shield urself . . . . . . . . . . . . (P)-aa deals more dmg

In extended trading, 's aa increases, unlike whose aa modifier get negated once shield wears away. In addition, aa range is only 25 lower than most adcs, which lets her harrass in lane a lot better than and have a lot more early game impact, which something i believe is very crucial in current meta maybe it's not, depending on elo.

ult . . . . . . . . . . . . . . . . . . . . . . . . v s .. . . . . . . . cd: . . . . . . . .150/135/120sec . . . . . . . . . . . . . . 110/95/80sec engage: . . possible but not great, mostly . . . . . reliable in teamfights disengage: . . very reliable . . . . . . . . . . . . . . . . . possible if skilled enough hurts to screw up: . heavily. . . . . . . . . . . . . . . . . not as much

i wont comment on dis one

EDIT: "situationally the better Janna", NOT "always the better Janna"