Me and my friend had this very same conversation today. He called and then got a ticket for Sunday, so I assume that means Logan Marshall-Green is still there then (I feel like most people leave on Sundays anyway). You can call the ticket office, though. I've seen him in a couple different things (including this), and he's worth seeing. I've never seen the other guy's work, though, so I have no point of comparison.
"I thought that that was just going to be a like one shot deal for me, you know, but they kept talking about it like, 'when we do the production, when we do the production', and I was like, 'yes, yes, when you do the production, cool, I will come and see it'". - John Gallagher Jr. on SA