Bonus units

This is a bit of an odd question. If the only bonus heroes I have are one of the Askrian Trio at 5 stars, or another random hero that I've got to 4 star +10 merge, which will yield higher points in the arena? The Askrian Trio are using their legendary weapons(except Alphonso who is Brave Swording) and their other skills are Reposition, and the rest are all 200 base SP skills.