utm vs lat/long
UTM and Lat/Long are almost interchangeable. It''s just the unit of measure.
What you find is that not all charts come in both units of measure. Sometimes they come only one way or another. The math by hand is a tad easier with the metric version and I can see why you would prefer it.
In the end if you feel more comfortable one way or the other then you''ll probably make fewer mistakes going with what you like.
FWIW, the conversion software to go between the two systems is far more accurate than the ability to make the chart.