Lighting wise this is what I know. I'm not too experienced so I hope telling you what I know may answer your question.
PowerSun is a UVB and basking light all in one.
ReptiSun 10.0 UVB is just UVB so you would need a basking light for that.
On a side note, ReptiSun 10.0 should be mounted in the tank because your beardie needs to be within 6"-8" and the screen filters about 50% of the UVB. When using PowerSun it is best to not use a screen at all because because of the screen issue and Power Sun requires the beardie to be further away.