For 4x5 and smaller films I use a Beseler 45 Universal head. Closed loop, 3 halogen lamps on the VC version, green and blue dichro filters, and a clear filter. Blue and green are for VC paper, clear for graded papers. The computer controller figures out "grades".
For larger negatives I was lucky to have found a 5x7 and 8x10 Zone VI enlarger. Both have the last version of the green tube/blue tube cold light head. These are closed loop through a Metrolux II compensating timer.
The Zone VI heads were somewhat intimidating at first. The box that controls the ratio of blue and green, has 2 dimmers, one for each tube, instead of contrast grades it has letters, ABC etc. I of course, found it necessary to mark the combination of settings that produced "grades".
I usually don't do much fancy, but I have done split printing using separate blue and green exposures.
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