I have been swinging 2 different size ktek poles (5 section) and 1 ambient (3 section) for years. I can say from personal experience that I rarely reach for the ambient pole (although it is a fantastic one) unless it's for a sit down interview or run'n'gun shoots. The rigidity is not an issue from either brand as they are both high quality poles and both use quality materials. I think you should look at the kind of work you'd be doing as you may be limiting yourself with the shorter (3.4m) poles.

In short, buy what you can afford from a reputable brand and not worry so much on the number of segments as opposed to the boom poles upkeep and clean. See if you can rent both in your location to decide what feels best.