Most people say how much better Paralysis is than Agility.  I'm here to 
compare them:
Paralysis:
GOOD
-Pokemon Cannot Retreat
-Pokemon Cannot Attack
-Pokemon Cannot use Pokemon Power (usually)

BAD
-Pokemon can become unparalyzed by switch or Full Heal
-Pokemon can evolve and become unparalyzed.
-Pokemon on bench can still hurt it

Agility
GOOD
-Pokemon cannot attack
-Cannot be rid of by evolution
-cannot be rid of by Full Heal or Devolution Spray or Switch
-If Pokemon dies and Agility works then the pokemon they bring forward is 
useless.

BAD
-Pokemon can still retreat
-Pokemon Power can still be used (with no effects on your agility-protected 
pokemon)

The scores for each are:
Paralysis-+3 for good/-3 for bad=0
Agility+4 for good/-2 for bad=2

Overall, agility wins.  Enough said.
-Brett3@aol.com