Boomers for my electrics and Martins on my acoustic. Why? Because for the last 20 something odd years, I've habitually walked into the shop and said Boomer 9s, Martin heavies, and 6 dunlop medium nylon picks. Sorta like my pre work ritual where I walk into the corner shop and say, cup of joe, pack of camels, and a lotto ticket.
Creature of habit.
If they're out of boomers, I'll pick up some EBs. If they are out of Martins, I wait until next time. That's all that's ever been on my only acoustic that I've had for 27 years. It's broken in with them.