When I hit 18 I decided to try out the bloody bay missions on different difficulty settings to see which offered the best xp rewards over time.
The mission I chose was listening post, where you need to destroy 3 pieces of equipment.
My mastermind is mercs/Dark. I made a couple of poor power choices (Manouveres and serum) which Im basically not using so hes not exactly optimal.
Mercs are slotted 4 damage 2 acc and spec ops is 4 damage 1 acc. They rarely miss orange and below with this setup.
Standard procedure for all fights was Tar patch and darkest night then let the soldiers do the work while I keep them alive. I have no primary attack myself. I put serum on Desmond (spec ops) for the boss fights but im dammed if I saw any difference to his performance.
Any way heres what I found.
VILLANOUS and MALICIOUS settings were very similar. Both had white and yellow minions. Gropus of 2-3 for villanous and mainly 4 for malicious. 2 seperate yellow lt's for bosses in Villanous and 3 yellow lt's + 1 orange boss for malicious. Trivial difficulty for both settings. Main differnce was more mobs in Malicious.
Xp for vilanous: 2511 in 17 minutes. 147.8 xp/min
xp for malicious: 3486 in 29 minutes. 120.2xp/min
VICIOUS and RUTHLESS settings. Again similar. Both had yellow and orange minions. Groups of 2-3 for vicious and up to 4 for Ruthless.Both had 4 orange lt's and 1 red boss guarding he equipment. Bosses could be trublesome if care was not taken, lost a soldier occasionly on Ruthless due to larger mob groups.
xp for Vicious : 3222 in 20 mins. 161.1 xp/min
xp for Ruthless : 4118 in 26 mins 158.4 xp/min
RELENTLESS setting. Orange and red minions in groups of 2-4. 3 Red lt's and a purple boss. Not as hard as I thought it might be. Boss only had 1 orange minion helping.
xp 4731 in 35 mins. xp/min 135/min
So from an purely xp perspective, for me anyway,Vicious and rutless provide the best gains.
I picked up 5 DO's in Relentless difficulty though which was nice.
One good tip for anyone doing this mission on the harder settings is that the equipment you need to destroy can be targetted with twilight grasp and it rarely misses these. Handy for the boss fights
If anyone else would care to do something similar with different builds I would be interested.
Major Look. lv 18 Mercs/Dark miasm MM. Union
Edit * Total xp gained was 96% of level 18 for these 5 missions