Depend
if you are much more inclined toward runtimes and constant output over the runtime, then the Opalec is for you. But if you prefer a more brighter light, one that dimming over time, then the inretech is good. Inretech does not work properly (eg, too dim) with rechargeable while opalec does support rechargeable. i am sure you know that opalec gives you indication if the battery is too weak (red light) while you have to notice the weakened battery from the dimming of the light in the case of the inretech.
Again, it is all up to you. At similar price point, it is just a matter of usage, would you prefer constant dimmer output and has long runtime or rather a quite-bright-on-the-start-and-dimming-over-time one.
Btw, why don't you go with the MM with lux 1W on the shoppe for $30 + shipping? it is only about $5 more.