Wich one is better Phallosan or SiliStretcher from matters of size?

I aready have a penis extender, and i cant wear it because it hurts and my penis get cold and also my flaccid penis is very small and varies alot in size and girth so its difficult to wear.

So i was thinking i need a phallosan or similar, so i can wear it long time during my sessions.

Need advice.