I use Super Bands, Titan and regular rubber.

Regular Flipper rubber - usually Red or Yellow depending on the game. I use Pinball Life for these, even though they may not last as long, they feel most natural to me. Rotating regularly helps the longevity, get it spun before it shows the signs of wear.
Regular white rubber on kickers. These I source from Marco as they seem to last a bit longer, but still have a good feel.
Titan on small ring applications that go on a single post.
Super Bands on all other multi-post rings.

I much prefer regular rubber on the flippers and kickers - it is here where I like the natural, standard option. Super Bands appear to be better than Titan on larger rings that go around multiple posts - Titans get really thin on the corners (I'm sure up-sizing helps, but then I'm not sure I like the feel). Titan does fine on smaller posts in most applications. I really like how Super Bands rebound, and will use them on posts that can be directly hit by flippers - it'll punish bad shots.

I like my games playing tough, and I try to utilize the options we have from varying ring manufacturers to this end.

Oh, and I choose white for all of my rings so that it looks like I'm just using regular rubber

If anybody has an impression on what rings, or combinations thereof, make games more difficult, I'm all ears!