Personally, I'm doing 25. I only use 6* gear, so the higher chance of 6* per energy is worth it for me.

I would say since all of your clan members can do 25, they should go for that. The only time I'd do 20 over 25 is if I were going for points during events/tournaments where energy was tight, as the points per energy from 20 is better than 25. 

Well group 4 can't do 24/25 so I am guessing they should stick to 20 :) And those that can't do 20, need to "get good" lol.

But I thought someone posted that 24 was better than 25 because of the energy difference but all the useful topics fall off the page for some reason...

Going off of hellhades, 25 offers an infinitesimally higher drop rate of legendary 6* gear in exchange for being worse in every other way.

Personally, i'll be focusing on 20, but i'm more interested in the tourney and event rewards than on the better drops from 24.

I guess it depends how quickly you can do 25.

I will be doing 20, mainly because i can do 20 in under a minute but 25 requires a more defensive team and takes me 7 minutes. Im not prepared to tie my devices up long enough to do 25

Mine are all slow, 3 min for 20, 4 for 24, 5 for 25

Im runing 24 at about 3.20minute runs so far

My runs are overnight so the time at 3.20 isnt an issue 

50 runs in dragon for 9 bits of speed gear 8 of which were junk 

frost gear dropping like theres a 5x event on hahahaha - typical 

Im  running  24  due  to  energy-  i  am  not  trying  to  use  it  all  up.  Also,  because  i  dont  like  the  affinity  of  25  much.  No  speedrun  team.  Hopefully  ill  be  able  to  make  one  once  i  get  Lydia  (in  a  couple  years)  as  i  have  Mausoleum  Mage  (for  Seer)  amd  Renegade,  though  neither  are  built,  only  Seer  is.

Used 2.5k energy myself, have picked up 18 pieces of speed gear so the drop rate looks about 12%

But none of the pieces are an upgrade to any champs, to be honest there are so many levels of rng involved that it needs the stars to align and in most cases thousands of runs to get improved gear so i am not that disappointed.