From the perspective of "centering the hull" on the trailer, bunks are easier. You'll be fine.
When you launch, back in until the back end of the boat JUST starts to BARELY float. Not so much that the stern is actually floating off the bunks - but to the point where it starts to rock a little. You can disconnect the strap and safety chain at this point. Start the engine and then reverse off. NOTE where the water line is on the trailer (wheel fenders or a spot on the frame, etc). When it's time to go back on the trailer, back the trailer in to this same spot. This is will be in far enough to allow easy loading all the way to the bow stop, but still allow the bunks to do their centering job.
You MIGHT want to back in to that "waterline" spot and then pull back out a couple feet the first couple times you launch. It'll be a little safer if you end up coming in a bit too hot.
This isn't an exact science, but you get the idea. My last boat was a big 28' Sea Ray cruiser - I was back on the trailer and pulling out (wife was in the truck) faster than 99% of the people trying to retrieve their 18' runabout. And I had a bunk trailer for that boat. Actually, it WAS a roller... but I converted it