I would suggest Gold for everyday use. It doesn't cost anything to use, and the 6 second wait time on R doesn't feel like a long time. It's useful for getting around. It's also pretty good against multiple enemies like all salamanders. Gnome is good for Tower use (If you can get around the random rocket explosion glitch, that is) and it's really fun to play around with in general. I would recommend it over the bad salamanders, but not White, Black, and Gold. I don't actively run Gnome on Tower and use the Black salamander instead.