I can't "compare" the two, but I do have the OPI LED lamp and I LOVE it!
It reminds me of Darth Vader's helmet, in a way.... lol It's heavy/metal/black/strong. It has a handle on top. so that you can easily lift in and out of its box. And I love the LARGE digit "digital countdown timer" that is on top of the unit. You can easily see how much time is left for mani cure (you can also use this one for pedis).
There is no "bottom" on this unit. I just place some papertowell sheets on top of my counter and then lay the unit over it. I have not noticed any curing issues in this unit vs one with a "mirror bottom" (ie, my Mally Beauty lamp has a mirror bottom). There are 4 button time settings on top of the unit (15 sec, 30 sec, 45 sec, and 60 sec). It cures most gel polish led cure brands in 30 sec. I have used it with OPI Gelcolor, Gelish, IBD, and LeChat sucessfully.
There is no "switch" to turn the lamp on for curing. Instead, you have to insert your hand into position (with all five fingers splayed widely apart). Once your fingers touch the back of the unit, the light comes ON.
To avoid "hot spots" (if you put the gel polish on too thickly!), I stick my hand in the unit, touch the back for the lamp to come ON, then I pull my hand quickly back out to the very front edge of the unit to do a quick mini-cure. I do this on the 45 sec timer. Once it gets to the 30 sec mark, I put my hands all the way back in to cure for the reg full 30 sec time. This has worked perfectly and I have NOT had any "HOT spot" issues happen with the OPI lamp at all (vs I did have issues with the Mally lamp in the beginning).
I hope this helps some....!