A brief note: we had outstanding service for quite awhile from a Generac portable. Could have used more capacity, but it worked...until it didn't. Bought a B&S with more capacity. Not my first choice, but it was available right then and has done OK since.
Whatever you get, they all need to run at least quarterly under about 1/2 load for an hour or two. This keeps the engine from freezing and cooks moisture out of the generator/alternator stator/rotor. Given the suspected humidity in Loosianna, maybe more often. Place I worked had backup generators that had heaters in the generator and diesel to keep them at operating temperature, constantly circulating, heated engine lube oil and they still ran them once a month.
Whatever you get, they all need to run at least quarterly under about 1/2 load for an hour or two. This keeps the engine from freezing and cooks moisture out of the generator/alternator stator/rotor. Given the suspected humidity in Loosianna, maybe more often. Place I worked had backup generators that had heaters in the generator and diesel to keep them at operating temperature, constantly circulating, heated engine lube oil and they still ran them once a month.