NOT to argue about a small point, but in a series of tests with a shooting machine, Randy Ulmer (I am pretty sure it was him) found the MOST UNFORGIVING bow in his creep tests wasa 2 cam bow!!! He actually UN-timed the cams (got them a little out of synch) to help it shoot more forgiving.
Again, I say there is NO inherit advantages to EITHER style of bow.
REALLY worried about level nock travel? MOST 2 cam bows do NOT have LEVEL nock travel! Darton is probably the best in this area, maybe the Bowtech Gen3 could be close as well. Even the Mathews with "straightline" cam is NOT Perfectly level.
How important IS level nock travel, ask the guys who won Vegas the last 2 years...not even using the "straightline" cams!
MY Final words on the matter (unless drawn out by someone ) If it makes you more confident to have "level" nock travel...go for it. If you think 2 cam bows are MORE accurate/forgiving...buy one. Confidence will make you more accurate than whether or not you buy a 1 or 2 cam bow.