the wide trim will fit any aluminum track, but the narrow will only fit the narrow track. Essentially, the wider trim will "bulge a tad bit more in a narrow track, but it also "pushes into the grooves better, so it won't come out as easy.
Heavy duty is "thicker, not wider" and holds up better.
Here's what I'd use, assuming you're looking for black molding:
A tip I find helps keep the "shrinkage from happening as rapidly" is to trim a "triangle about 2" long at the end of the trim run and fold it back under the trim. That gives you a "finished edge" as well as "doubles the end to strengthen the hold by the screw"....
Here is a "vinyl trim end cap" that serves to even further strengthen the ends: https://www.amazon.com/Camper-Traile...1650607&sr=8-2
Take a look at your trailer to make sure the end caps will fit. On some trailers, there's no place to use an end cap as the manufacturer transitioned to a different type of trim and butted the two together.... But on almost all applications, the trim cap makes for a neater, more secure finish to the installation.
Even using the trim caps, I'd still fold the end triangle under to secure the trim in place....