Assuming the light output is the same then I would go for the square ones, 3 reasons:
1. Roof rack remains usefull cos theres no lights in the way what with them being mounted below the bar.
2. Less likelyhood of them getting damaged by trees etc.
3. The truck'll fit in more multi-story car parks and the Maccy 'D' drive thru...
This posting may have been helpfull, on the other hand probably not... Either way, I may have had drink when posting it in which case it's probably not as helpfull as it could have been
Work safe, and remember all technical problems can be resolved with a hammer, the trick is knowing where to hit it and how big a hammer to use (I often find it may also help to have a spare bit in the shed to replace the bit you have just mullered

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Work in Progress (or not as the case may be) I give you....
'O-no' the truck.Comments on 'O-no' the truck may be left
hereWork in Progress (or not as the case may be) I give you....
'Truck'Comments on 'Truck' the truck may be left
hereOwning a 2.8 is a hobby in it's self...