This is a loaded question, since saying one show is best can be an insult to the person who's on opposite that shift, and I do not wish to tick off any of my cohorts.
So instead, let me say what elements and shows I find of personal interest:
I like the current format on Kool 98. Very good playlist that focuses on core Classic Top 40. Shifts are in the right places, with good formatic and elements positioned just right. It is no wonder their ratings show up pretty good.
Also, the format on 950 is very solid, with polished timing on the spots and elements. Also, weather coverage has been much improved, as is the round the clock live news coverage from Fox radio.
Mix100's formatic is also pretty tight now. A good Adult Top 40 (not Hot AC) format during the week, very deep fluid playlist, veteran jocks, and their 80s weekends are more consistent with what stations actually played in the 80s. It's 80s by the airpower, instead of by the charts. Smart move!