The beer with the least amount of sugar is the best for a diabetic.
That is why you see many beers like Ultra on the market. The
hops has nothing to do with it. It might give the perception of
being more bitter from less sugar, but that might just that ...
a perception. In fact it might contain every bit as much sugar.
I was going to experiment by fermenting a beer to near completion,
adding Splenda and artificially carbonating to get the fizz. I never
did, but it might get closer to that Ultra type beer. I'm guessing
whatever is done to produce a "Lite" beer might be close to
the same process. Less sugar = Less carbs = better for a
diabetic.
Alternative plan B would be to enjoy a regular beer and avoid
potatoes, carrots, breads, pizza and most things made with
simple carbs like flour and sugar.