My favorite music of all time varies as I age. If we're talking genres, it would probably be techno, particularly Trance style, but as of late, the "techno" band I enjoy the most is Above and Beyond, so probably not "trance".
After fiddling with Pandora for a while, and seeing what song elements were a common theme for me, regardless of genre, I'm apparently a big fan of harmony, melody, and drums. So, if you have those in your music, I'll probably dig it.
Examples of bands I like that all had similar elements from Pandora were:
Faith No More
RUSH
Breaking Benjamin
TOOL
Various rock bands that I never really listened to but apparently had similar elements
Lots of electronica
There aren't a lot of bands that I consistently like everything they do, most bands I like a handful of their songs, and could do without the rest. However Faith No More, RUSH, TOOL, and Breaking Benjamin consistently put out product that I enjoy the majority of it. But I also like to slap on a random techno podcast and let the various songs flow into the background of whatever I'm doing.
Currently I'm soaking up this one remix of a Lana Del Ray song, that just has fucking teeth to it. The original is...ok I guess, but this remix with the added synth stuff just really hits my "yes please" button.