I'm late but Martin D28 sets the standard so it's a safe choice.
Most all guitars, made of the proper materials, are a good choice. Remember that stage is entertainment and recording in a studio is biased around sound quality. That's why the Martin is chosen in studio and in solo because of their exquisite sound and butter-like smooth action. Louder Gibsons, showy Guilds and others are played in shows and stage. Flashy guitars sometimes are used despite poor quality. The stage and crowd noise forgives all flaws and sound Engineers balance everything anyway.
You play a Martin D28, properly set up including Martin light-gauge bronze-wound strings, then pick up a Gibson J-45 and they will feel and sound so different. Hands down, the Martin’s lower action feels like silk and you miss fewer times and can stretch them until they squeal. (Don’t play Deliverance).
But, on stage, I leaned to the J-45 because I needed the sound to project more. When I play Jim Croce or James Taylor, I go Martin though. They are mellow and string intensive. Pure musicians must play Croce like Croce and Taylor like Taylor.
When I go to Neil Diamond, Cat Stevens or Beatles, it’s the J-45 hands down. Then when it’s just strum or playing sing-along, I liked the Guild Jumbo F-50 Arch-backs the best.
Alternate tunings were also superior on the J-45 and Harmonics on J-45 were the best.
I owned about 10 other guitars over the last 37 years including Alvarez, Fender, Ovation and I currently own a Martin DX1 (which I love by the way) and a Yamaha (oh crap I forget which model) and the above 3 (Martin D28, Gibson J-45, Gibson F50) are far superior than all for the reasons I state.
Unfortunately they are all extremely expensive guitars and I never had any of the 2 together so I just kept changing my repertoire around the axe.
Back to the Martin DX1, since I stopped paying $2,500 and up for guitars, this sweet baby sounds so close to a D28 that I thought I accidentally picked up a D28 when I first strummed it. I had to look twice. After playing it 2 months, I see it doesn’t handle weather and humidity as good as the top shelves but that is just a tuning inconvenience and it is fine until the next weather change. Also, if you have a really good ear (or a tuning meter like me lol) you would see that it drops tone on reverb. It is unnoticeable to the unpracticed ear but I’d hold this axe on stage anytime and apologize to no one. I am playing 3 hours a night again.