Hmmm... I've read EoM (once, six months or so ago) but I haven't used it. IIRC (bit if, there), EoM had a set SP limit per day, and had multiple classes with different spell-effect lists. Neither is the case in True Sorc. There's only one base class (plus a D20 Modern advanced class, and variants for IH, Thieves' World, and True20), which has access to all the spell effects (talents, as they call them) in the book. Further, the amount of magic you can use in a day depends largely on your Constitution; your Con bonus reduces the amount of subdual damage you take per spell, and the more HP you have (and ergo, the higher your Con bonus), the more subdual you can take before you knock yourself out (hence, gnomes are a favorite for my true sorcs).
Not having played EoM, I can't really compare ease of use or balance. Looks like I didn't quite make it through the apparent learning curve... One thing that True Sorcery does great that I'm not sure EoM supports is swift action spells... it's pretty typical for my sorcs to put out a swift and a standard spell each round. Of course, your swift actions spells are weaker than your standards, but they're still great to have.