Pecos Bills and Backlot Express are both CS meals, not table service meals.
MK doesn't have any really stellar TS choices. It's just not a great park for dining (unless you're looking for character meals). I recommend you aim to do CS at MK, or take a boat or monorail to one of the MK resorts for a meal at one of the great TS restaurants there. That's going to be a lot better than trying to make-do with the choices at MK.
D-MGM has a bunch of great TS restaurants. The Hollywood Brown Derby is the only signature restaurant inside a theme park, and the food and service warrant that distinction. 50s Prime Time Cafe is the quintessential Disney dining experience, marrying great food with theming and "show" that are hallmarks of why people enjoy eating meals at Disney restaurants. I'd choose between those two.