I just got done playing with the custom jet squelcher on the two current maps in rotation, saltspray and blackbelly. I played 3 matches, and I won two. Both the ones that I won were on saltspray, while I lost in overtime by 20 points on blackbelly. The custom jet squelcher seems to be much more limited than the default one on blackbelly. In order to use the kraken I must give up my position and it takes valuable time to get back up there. I went 8 and 0 that match and held my spot the entire time, but my team couldn't keep up and in the end we lost. Throwing the bombs over the wall is a nice touch, but hardly as useful as having the splash wall and inkstrike.
With the inkstrike available I found I had the ability to capture both points simply by camping that one spot. Without the inkstrike there wasn't as much I could do in that war of attrition but hold my ground and hope my team could fare without the cover. On saltspray, the kraken can do a good job of clearing the zone of enemies, but that comes at the expense of both the inkstrike and splash wall, both of which are very useful on that map. In the end I want to favor the regular jet squelcher for these two maps as well, because just like before the custom one holds up decent on one map but is limited on the other, while the basic one excels on one and does decent on the other.
If you want to be an anchor
@Zonderion , the splattershot pro will certainly work for that role, but it has less range than both the chargeshots and jet squelchers, so it can be outmatched in certain areas. The splat bombs it comes with aren't particulary useful for camping in my opinion either, but that's more just my playstyle. The inkstrike is incredibly useful however, so in the end the splattershot pro will work pretty well for anchoring. It also can work decent for approaching too since it is reasonably strong.
Personally, I prefer the jet squelcher for that role, as you can probably see by this point lol. I like the eliter 3k as well, just because it can outrange everything else in the game. I think it's a very limited weapon on some maps though, which makes it harder to recommend. The jet squelcher is balanced enough to do well on pretty much every map in my experience, and it has the tools to really lock down areas and keep out enemies. So feel free to give it a try if you're looking for new weapons to try out.