I'll also add that the ability on the other cameras (in contrast to the TGs) is that you get complete control and TTL. G7XIII allows manual mode and TTL. The EPL10 does as well. Nothing ruins a fish shot by having to work around camera settings to get ISO, shutter speed, and f-stop set where you want it and you do not get that control in the TGs (there are work arounds). I think you will see significant improvements in an upgrade from this alone. I also always dive with a strobe though, and would suggest it for you was well. Small ones are really helpful to get colors to pop.
I like the TGs because if the housing leaks, the camera is ok. Also if you put it in clownfish setting, the photos usually just work pretty well. But if you want to really control the camera, then they start to be less ideal. They are awesome for macro, though.




