The heavy, no matter the varient, is the splattershot of splatlings.
You can do whatever with any splatling, so long as you have the aim for it.
I would probably benefit from playing more mini/heavy splatling, as I tend to want to rush in and catch the enemy off guard whenever they are vulnerable enough, as these two are faster in every aspect for such encounters...
but I personally just love the superior range, POWER(I still don't understand why they buffed the damage of the highest dps gun in the game, but I ain't complainin' ^_^), and (most importantly) super sleek metal look of the hydra over the other splatlings. It's a good feeling when you know your opponent is stunned while respawning from a close-quarters hydra ambush =P=P=P
And, of course, custom hydra has the sprinkler =D