I give Frigid Protection a couple of cool points for being Absorb instead of Regen, but I give Metabolic Acceleration perhaps a point or two more for not drawing aggro.
 
	 
 
	Ultimately, I also think /Ice has the more appealing melee attacks while /Atomic has Beta Decay. So it’s a tough choice between the two. If you have enough damage from Primary/Ancillary, maybe lean /Atomic for the +recharge. Otherwise, consider /Ice.
 
	 
 
	EDIT: I see you referred to Freezing Touch and Positronic Cell as copies. This is not the case. Freezing Touch is a melee attack and does a lot of damage before procs are even considered. Also, yeah, don’t skip Beta Decay.