Taca would probably be your best bet on that route unless you are into any other loyalty program that would get you a status boost or such. They fly newer airbuses, and have an excellent on time record, as well as free food and drinks on their flights. They have good prices and have been known to upgrade non elites on routes to/from US where few of their elites fly.

The airport in El Salvador is easy to use, and mostly orderly.

You should be good. Have fun.