Hard to judge them in a vacuum without a secondary pairing. IMO. Looking at mainly Control and Time to Defeat as main categories.
In terms of overall control I rank the primaries as such:
Earth/ - King of control and can lock down multiple groups fairly easily
The next three are fairly close in my book; Plant/ is a bit of a "two trick" pony, certain mobs resistant to Confuse effects degrade it overall performance. Creepers picks up the slack in these situations.
Illusion/ - Strong control but suffers in larger mob density; can control two groups at best in most situations
Gravity/ ** would probably fit here.
Mind/ - Weaker in overall control mainly due to low AoE control uptime. Small tweaks to TK, Total Dom, and Mass Confusion would catapult this set to "stellar" levels control
Weaker overall control in my book. Ice/ could use a buff to Shiver, an improvement to Ice Slick's uptime. AA could use a tweak. Elec/ chain mechanics lead to critical failure of AoE control (miss the first miss the group). Pairing these two with their secondary complements e.g. Ice/Cold, Ice/Storm, or Ice/Time and Elec/Kin/Mu or Elec/Poison/Mu increases their effectiveness significantly.
In terms of ST damage I rank the primaries as such, no order unless specified:
The following are on the lower end of the ST damage spectrum.
In terms of AoE damage I rank the primaries as such:
Mind - May rank slightly higher but would have to test.
** If this exercise is to improve sets in the future, the main candidate sets needing the most help are Mind/, Ice/ and Elec/; Earth/ could use a damage buff. Mind/ deserves a "secondary effect" other than reduced accuracy and reduced endurance; most Psi/ has -Rech but other effects may be appropriate. AoE Hold uptime seems to be a prevalent concern across the board (except Dark/ and Earth/); I would add that Holds vs Stuns should be looked at to differentiate the effects. I personally think Sleeps should be looked at again. This could benefit sets that need the help such as Mind/ and Ice/ but would also buff sets that don't need the help such as Earth/ and Plant/. I would also reexamine "Containment" and what mezz status applies the effect.