Kero will be harder to light and pre-heat. Will add a small bit of extra cooking potential but not a lot or even noticable. It will soot up the burner a lot more and need more cleaning. The fuel does not evaporate well and stinks.
I have used and will not use anymore, Coleman and Crown white gas stove fuels are what I like, by far.
If you just have to mess with kero make sure you have a Whisperlite International NOT a standard Whisperlite. Bigger fuel line does not soot and clog as fast.
Standard Whisperlite with small fuel and pre-heat loop.
Whisperlite 600 International, with large fuel line pre-heat.
Want to keep your burner soot free? Use alcohol to prime it.
butthead