Honestly, I've decided that Suction Bomb Rush is my favorite and not simply because the Splash-O-Matic comes with it. It's very good for claiming territory quickly and forcing foes to back off or get splatted, though it does have the weaknesses of each bomb needing time to explode and getting distracted and unable to see other Inklings coming at you. Then again, the former's why you can use it to zone away enemies in the first place; the threat of getting splatted is usually enough for them to scamper. As for the latter, I can easily overcome it when I realize that Bomb Rushes are actually free ink for both main and sub weapons for a limited time. Thus, I can fire off a few bombs, pause, and if I see someone getting close I can use the infinite ink to shoot them if not escape to safety for more bombs while the rush lasts.
Burst Bombs are also pretty good for damaging foes and thus making splatting them a little easier, and I can see myself using a Bomb Rush of them for pure offense if not grabbing territory.
A Splat Bomb Rush, however, is a little more tricky. Since they don't stick to the surface like Suction Bombs or splat immediately like Burst Bombs, I need to make sure they stay on the ground until they detonate, something that won't happen if they fall off. Thus, I can't really use Splat Bombs to grab small or weirdly-shaped surfaces like the paintable tops of walls (though they might be a good scare tactic to get enemies off those areas if they don't know that).