Subclass Skills for ISS/<Summoner or Healer>

What is the best sub-class skills for dual "ISS/Summoner" and "ISS/Healer"?

My lv86 ISS ta in almost 87, I'm leveling my summoner, he lv72 (dual).
My wife leveling Healer (lv70, dual)

I'm thinking that way for my skills (Suclasse), in both cases.
lv3 Sub - Critical Rate Increase (http://l2wiki.com/Sub_-_Critical_Rate_Increase)
lv3 Sub - Atk. Spd. Casting Spd. Increase (http://l2wiki.com/Sub_-_Atk._Spd._Casting_Spd._Increase)
lv3 Sub - Critical Damage Increase (http://l2wiki.com/Sub_-_Critical_Damage_Increase)
lv3 Sub - MP Consumption Re-use Time Decrease (http://l2wiki.com/Sub_-_MP_Consumption_Re-use_Time_Decrease)

What do you thin?

I'm afraid I can't be of much help so maybe some experienced ISS can help him out here.
These subclass skills are just minor stat improvements, which work on all of your character's main/dual/sub class, so personally I would just choose whichever you think seem useful for all of your character's classes.

lv3 Sub - Atk. Spd. Casting Spd. Increase (http://l2wiki.com/Sub_-_Atk._Spd._Casting_Spd._Increase)
lv3 Sub - MP Consumption Re-use Time Decrease (http://l2wiki.com/Sub_-_MP_Consumption_Re-use_Time_Decrease)

Boath Are good options for iss, but Wynn not use to much MP like wynn, and Casting Speed.. for Wynn.. maybe good for cast Debuff and Magic Atacks..

The MP Consumption and Reuse is the best one for Wynn, cause of the Reuse. Wynn can use more MP if you actually play the whole class, too, especially in a mage setup.

After reuse the p/m.crit is clrearly best.

after that i'd get the p/m.crit dmg...