Is it better to use Gatling Peas or Fume Shrooms for Endless Survival?

I'm playing Endless Survival in Plants vs Zombies on my phone, and here is my current setup:

I originally had a Gatling Pea on the top and bottom lanes, but then I realized that while it has a bigger range, the Gatling Pea only hits the front target, which can really clog things up with large hordes.

The Fume Shroom on the other hand, while it has a shorter range, hits everything in its range.

I did a bit of research about how much damage they both deal, and the Gatling Pea deals 20 damage per pea (so 80 per round) and the Fume Shroom also deals 20 damage per Spore, however it only deals one shot per round.

Which is the better option for Survival mode?

When playing Endless Survival, Gatling peas are sub-par compared to any AoE due to the enemy clumping up. But even then, Fume shrooms are not the way to go.

Some basic tips for Endless:

Cattails are the best, simple due to their high damage and ability to shoot anything, make sure your pool area is only them and possibly tallnuts/fumeshrooms on the first two rows. (so you won't have to have any plants defending the back)

After that come the Melons, Melonpults deal an insane amount of damage to anything due to their AoE bursts. No single line shooter (except for the Cattails) can do better. And if you want you can give each line 1 frost upgrade for the AoE slow effect.

The last important damager you place on the third row from the end (or second row from the end in pools) and it's the fume shroom. Why? it is still able to hit any target around it even if it's still chewing on the plant on front of it... place a Tallnut with pumpkin in front of your fume shroom and it can safely attack those.

Lastly, spikey grass on the very first lane to deal damage while they are chewing on the pumpkins and to take care of Zombonies.

Additionally, umbrella leaves should be spread out more, never less then 2 spots between them otherwise you are wasting coverage.