I was thinking that maybe EXP and Favor gain would be good in high arenas so I tested it. Unfortunately, for me I feel like maybe I wasted my time. Grinding Monoliths is not only more rewarding, its also much faster Favor/EXP when you have 200+ corruption and even better at 300+.
Although I still wanted to post the numbers I used to test so the information isn’t wasted.
Starting favor 11780
11780 Favor Tier 3 start (+1428)
13208 Favor Tier 4 start (+2371)
15579 Favor Level 111 Endless Start (+302)
15881 Favor Level 115 Endless (+3897)
19778 Favor Level 200 Endless (+1257)
21035 Favor Level 220 Endless (+1214)
22249 Favor Level 240 Endless
And then I did one monolith.
22249 Favor 41/64 bonus stability on 218 corruption (+1333)
23582 Favor Picked up the 3 experience books (+1414)
24996 Favor