Hey Pura, what's up homie?
I love my horizontal parabolics hood (vertizontals).
I use 1k's in 4 footers.
From my experience they are great! They are definitely the best option for spreading the light to many plants.
With a 600 I would think the 3 footers would work best.
You can fit a shit ton of plants under them and they all do very well.
Probably not very good for use with CO2.
The only hood I think that would come close are the xxxl hoods with tempered glass.
Hope this helps!