So I had a go at the Cherry H-3 and, well it is user friendly...almost too friendly xD. Splash walls are a big help in firefights should you ever be involved in one. Stack a little bit

(1 main or 3 subs),

or

and you'll last longer than a 96 deco most of the time.
Bubbler on the H-3 feels like the rapid blaster, it's a getaway tool, or a pushing tool. I mean if things aren't going well, bubbler!... And the tides will turn to your favour... Yet unfortunately thanks to the precision the H-3 needs you'll find that most foes will just out strafe you if you don't know how to deal with it. And Unlike the Rapid Blaster (Who's bubbler strategy is very similar i reckon) you can't "spark" nor use an Inkmine to drive CQC away. So it might just end in a stalemate every time or the foe wins because they gain control of that particular turf you were fighting on should you retreat.
Since Splash walls also like to make you abuse your range, the H-3 is kinda...well, not so much "Heavy"- 3 anymore. Because at max range the damage starts to fall off, even at level ground. And this takes 1 burst K.O's to 2 bursts. So, it's kinda being harsh on itself, but it isn't really noticeable unless you really pay attention to detail.
So really, when picking one of the H-3's It's about how you want to contribiute to the team. The vanilla (The one i use the most) is the most balanced out of the 3, as it can perform a killing/front line role, ambusher/flanker, inker, a little bit of area control and with Echolocator. You can be support.
The H-3 D....Er... Well, in my opinion it's absurdly hard to use. It plays like a patient sniper that can't get itself functioning properly. The Dolphin focuses on inking, and picking off easy targets. And i mean
easy. Unless you can fully land your burst you shouldn't get into a firefight with the Dolphin. This weapon is for Gods who have mastered the H-3 in every aspect. Well, that's how i think of it. Kudo's to you if you can use it xD
And The Cherry is the family friendly version that everyone loves.Like the Vanilla, it can play a multitude of roles, but plays each role a bit differently. It can't track anyone, but it can spread invincibility which majorly can help at desperate times. Think of it as a passive 96 deco. Virtually the same kit and power, but the H-3 can ink better and get specials faster. Unsure of how else to describe it but yeah that's how i think it is.
TLDR
Cherry H-3 Is alright. I like the vanilla more though at the moment. At least Nintendo are trying to make the H-3 visible xD