Is there a specific brand you recommend? I've seen some debate on wether organic feed is better or not.
Setting aside the issue of price, an Organic feed from a nutritional standpoint is almost always inferior to a non-organic feed.
There are two reasons for that, the first of which has nothing whatsoever to do with the fact that its organic, and everything to do with manufacturers chasing after marketable buzzwords. "Organic" is often found in conjunction with "soy free", "vegan", "whole grain, "no added chemicals" and the like - all of which further restrict what can potentially go in the bag to make up that complete feed, or, in the case of "whole grain" facilitate feeding behaviors which let chickens pick an incoplete diet based almost entirely on their level of dominance in the flock while the all important nutritional suppliment appears as "fines" (dust) at the bottom of the bag.
The second is because the label "protein" on the bag is being used as an indicator of key amino acids levels (more protein, greater choice of meeting the minimums...). In declining order of importance, the four most critical Amino Acids for a chicken are Methionine, Lysine, Threonine, Tryptophan. If the level of any one is inadequate, additional amounts of the others are simply wasted - the chicken can't use them, and thus excreted in the waste. It is remarkably difficult to find a source of methionine in the plant world which is concentrated enough to meet a chicken's needs.
One of the best (common) plant sources is soy meal, but of course "soy free" is frequently found on the bag right next to organic. Better still are many meat sources - fish meal, crab meal, blood meal - but few of those sources are available certified Organic at commercial scale, and there's that not infrequent "vegan" word on some labels.
There are a few relatively high methionine seeds, but they all bring high levels of fat with them - like a multi-vitamin wrapped in a stick of butter.
Now, one can add synthetic methionine, and most do (as do a large number of convential feed bags), but the amount that can be added is relativel small and limited by the regulations setting forth organic standards - there is a pronouced effort to try and remove it entirely, in fact. That trend is most obvious on bags labelled "no added chemicals", meaning they likely left out synthetic Lysine as well.
So no, "organic" isn't inherently better.
Its usually worse. But the only way to know for certain is to compare nutritional labels. and to know enough about a chicken's needs that you understand what you are reading.