If I went with Balta over Chol, heading into finals, it would be because I felt Balta would never lack self-belief, whereas self-doubt could affect Chol if things weren't going too well.
Having said that, the MC may decide to play all of Chol, Balta and Nank against West Coast (if it's dry), with Balta replacing a smaller guy. Adding Balta doesn't mean sacrificing pace, it means enhancing aerial ability. The beauty of this week's match is we get the chance to practice something against a likely Grand Finalist.
Maybe the MC could rotate Chol and Balta through one 'wing' (anywhere between the arcs, really) with our guys being instructed to play through them when appropriate. Make the Eagles worry about us instead of vice versa.
Maybe experiment a couple of times with them both on the ground, on opposite wings, and have Lynch and Riewoldt lead high up the ground, dragging the likes of Barrass and McGovern with them, while Noah and Mabs fold back into the F50.