My preference (as a writer) is to hear the normal lead part NAILED. Nothing fancy, not a lot of "gee, think how good this would sound up an octave" (bass trombonists who say "...down an octave" are just as guilty!).
My favorite trumpet players are those who can absolutely nail the part, which makes sense with the other parts. One of my absolutely favorite players out there is Jerry Hey, for that reason. If you listen to his playing on the following cuts you will hear phrase after phrase of amazing lead playing, with an occasionly zinger, but those are few and far between, which is why they're special when he does play them.
On Dave Weckl's "Master Plan" CD:
Tower of Inspiration
Festical de Ritmo
On Chaka Khan's "What Cha Gonna Do For Me" CD:
We Can Work it Out
I Know You, I Love You (<---amazing in the chorus phrases)
And Jerry, Chuck Findley and Gary Grant pretty much give a clinic on
Al Jarreau's "Jarreau" CD, particularly:
Boogie Down
Step by Step
Save Me
Black and Blues
Love is Waiting
and Jarreau's "High Crime":
Imagination
High Crime
(One amazing thing to hear on the Jarreau CDs is to turn up the volume just as each cut is ending--some of the most amazing playing is as the board fade is happening. Make sure to turn the volume back down before the next cut starts!).
In live playing some of the most impressive playing is that which shows the same restraint and taste that goes into recording; for some reason we can as players let our emotions get the best of us during live performance (and the crowd may be dazzled), and yet listening to a recording the next morning we often don't end up being that impressed with what we did the night before. :)
<steps down off of soapbox>
john