Damage is more worthwhile. At low levels, your crit chance is so low, you would never break even on total damage output. Especially considering that +20 DMG is a large increase at low levels. With crit values below 10% for sorcs at low levels (I'm assuming somewhere between level 10-15), you would need a +30% crit or more to make up the difference, based on my rough math.
Consider these statistics, based on 100 attacks from a mainstream geared level 10(give or take) sorc. Assume auto-attack damage only and that crit does 200% damage of a normal auto-attack.
Crit based build (+15% Crit):
DMG: 60
Crit: 30%
Total Non-Crit Damage: 70 * 60 = 4200
Total Crit Damage: 30 * (2 * 60) = 3600
Total Damage Output: 7800
DMG based build (+20 DMG):
DMG: 80
Crit: 10%
Total Non-Crit Damage: 90 * 80 = 7200
Total Crit Damage: 10 * (2 * 80) = 1600
Total Damage Output: 8800
Keep in mind, this is auto attack damage only. Skill damage is based on your DMG stat, so this disparity would be magnified even more.
Here is a chart for quick reference. Note that this is just a rough calculation and that there are more in the game (like armor/hit rate/procs/etc) that needs to be considered.
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