I agree it's hard to choose between Holman and Ireland. You could play Holman on the right or left, but I think he's best central.
I think Ireland is best at exploiting the space, particularly away from home on the break. So I'd probably go for Holman. Lambert's approach appears to be: if you've played well, you get another chance, too.
We'll need more composure and quality in those attacking midfield positions though. Holman, Weimann and Gabby have all been a bit headless chicken at times.