I've heard in a few places to stay away from deli meats. Can anyone confirm or refute this?

I'm looking to add size but am trying to do it slowly rather than bulk and cut. So essentially, I'm trying to gain lean muscle while avoiding fat retention, which is difficult.

Deli meats (sandwiches with whole wheat bread and lettuce) would seem to be a good meal, but I just wanted some opinions.

Thanks in advance.