Hello Ellotris Guardian, first of all sorry for my English,
Ill try to explain this very easily.
I will give u 2 examples and u can decide what is better!
How to Calculate?
First of all we will comparate in all this examples HP/EXP and after having this relation, we will calculate making, x Damage, how many exp u can get.
Example 1: Gazer Spectre - 4.500hp/4.200Exp Relation If u hit 1hp, u will win 0,9333.. Exp
After having this relation we will compare if we will hunt this monters monotarget or Aoe (area damage), and how many monters u can get in a particular respawn.
And after it we will calculate what monster is better for hunt, (for sure, only looking for exp).
New monsters:
Adult goana: 8.300hp // 6.650exp Relation: 0,8 exp/hitpoint AOE (normal hunt máx: 45/70 mobs)
Ripper Spectre: 3800hp // 3500exp Relation: 0,92 exp/hitpoint AOE (normal hunt máx: 10/15 mobs)
Burster Spectre: 6500hp // 6000exp Relation: 0.923 Exp/hitpoint AOE (normal hunt máx: 8/15 mobs)
Werehyena: 2700hp // 2200 exp Relation: 0.81 exp/hitpoint AOE (normal huntmáx:15/20 mobs)
Old monters:
Dragon lord: 1900hp // 2100exp Relation: 1.1 exp/hitpoint MONOTARGET (normal hunt) // AOE (POI max10/12)
Grim reaper: 3900hp // 5500exp Relation: 1.41 exp/hitpoint MONOTARGET (normal hunt) // AOE (Drefia max 4/5)
Wyrm: 1825hp // 1550exp Relation: 0.84 Exp/hitpoint MONOTARGET (normal hunt) // AOE (Drefia max 8/12)
Conclusion:
Old Monsters can seem are good for exp, cause theyr relations are little highers than new monsters, but remember this relation are EXP WIN / 1 HITPOINT.
As u can see on the last part of the comparation, many new monsters can be hunted in aoe damage, with big lures and big amount of monsters while other old monters was designed for being killed 1by1 or making little lures.
Comparating 1 turn in drefia, with GFB atacking 3/4/5 Monters with a damage of 350 aprox.
3 GRIMS - 350x3= 1050x1.41 = 1480exp - That means 1 Gfb to 3 mobs will give u 1480 experience points
4 GRIMS - 350x4= 1400x1.41 = 1974exp - That means 1 Gfb to 4 mobs will give u 1974 experience points
5 GRIMS - 350x5= 1750x1.41 = 2467exp - That means 1 Gfb to 5 mobs will give u 2467 experience points
If u compare other places like Cathedral as duo, flimsy solo, or goannas, u get something like this.
Bursters Spectre with ek
8 BURSTERS - 350x8= 2800x0,923 = 2584 + EK TURN (he will probably hit more to only 8 monsters) - TOTAL 2584 EXP / GFB
12 BURSTERS - 350x12= 4200x0,923 = 3876 + EK TURN (he will only hit 8 monsters) - TOTAL 3786 EXP/GFB
If u finally compare the biggest lure of old monsters:
5 GRIMS - 350x5= 1750x1.41 = 2467exp - That means 1 Gfb to 5 mobs will give u 2467 experience points
with medium lures on new respawns
12 BURSTERS - 350x12= 4200x0,923 = 3876 + EK TURN (he will only hit 8 monsters) - TOTAL 3786 EXP/GFB
Makes an insane diferent after 1200+ Gfb/h
5 grims - 2467 exp/gfb - after 1200 gfb - 2.960.400 exp
12 Bursters - 3786 Exp/gfb - after 1200 gfb 4.543.200 Exp
As my personal experience (RP 1040 + ED 830+ both hand leveled) i feel like new areas are better just cause are prepared for make insane lures and kill monters 30by30 and not 3/4 by 3/4.
I hope my answer helped someone!
Greetings, Gleemody