Which is Better? FC or ES?

Fast Casting and Energy Storage.

An E/Me can spam, than re-fill.

A Me/E can spam faster, but not as many and re-fill. Also, with skill and attribute switching, this guy can become an interrupter or energy denier.

So it seems to me that the E/Me is limited in its application, whereas the Me/E can fulfill the same functions, and be more besides.

Or am I totally off the mark? I want to make a "magic" only character, and cannot decide which is better, since I haven't done either before, and feel that if I get too far, and find out that by going Me/E I nerf myself from being able to use E nukes in the first place, I will have wasted a lot of time.

I know the Me/N combo is great, sort of like total battlefield domination and control, maybe I should just do that? If I go Me/N though, what would be a good secondary for the Ele, considering that I don't want it to be a Monk?

I was kinda wondering the same thing about FC and ES. Would a Me/Ele make a better Blasterson than the opposite?

I would go with energy storage. As far as i know an Mezmer has 25 energy (+ what ever wand and off hand item). My Ele/Mo has 109 energy inc wand and flame artifact. Several of the high damage ele spells require 25 energy if you a Mezmer you will be lucky if you can cast 2, where as an Ele can cast at least 3 or even 4 if he has a good wand and artifact.

Mesmers have 30 Energy.

Remember, with Fast Casting, Energy Tap and Energy Drain cast very quickly.

Fast casting guide: http://www.gwonline.net/page.php?p=131
Tells you the time taken of the original time based on the rank. As for energy storage you don't really need to look at anything. Personaly I'd rather be e/me.