Which lighting fixture should I buy?

[mike31154]

With T5s you'll be needing to change lamps periodically. More mercury to dispose of responsibly & extra cost over time, not to mention they will probably be phased out over time, particularly tubes in the spectrums tailored to our hobby. For a FOWLR you should be fine with either of the LED fixtures you linked to (they're both close in terms of the lumens output), but for a few dollars more you could get something a bit more powerful to future proof yourself if you decide on more coral etc.