There is no don, there's a bunch of distributors most of which are doing their own individual thing. The bigger companies will always have an advantage while the smaller ones struggle to put their 'vision' on the table through lack of cash and what not... invariably the smaller ones are often acting as middle men between customer and 'big' distributor.
Anyway here's my reading of some techno distributors...
Just Music are strong, their stuff sells fast and they represent a fair amount of labels, which can wander into slightly more obscure territory than your 4/4 club techno.
Neuton are efficient and carry a lot of good stuff, for a company of their size it's the way it should be though.
SRD do some decent releases here and there. Customer service is shockingly bad though.
ELP are Prime revisited in a lot of repects, but the Swedes are defintely helping them steer the ship... Beyer and co. have really improved of late.
NEWS I'm not so familiar with, but they do seem to carry a lot of decent club techno as well as some of the flagship Brummy labels.
Triple Vision carry a lot of good upfront hard techno, 'nuff said.
Jaxx releases I like, they are certainly the specialist for the dark/broken beat dancefloor sound.
Pure Plastic I don't think a whole lot of bar a couple of releases here and there. They probably do decent business but the general output isn't very forward thinking in my opinion.
Elektronik as has already been said, have loads of potential and I hope this is realised. Will be interesting to see how the Open Source label works out and what other producers come in to join Jeff Amadeus and Dirty Bass.
Possible don't do a whole load techno wise bar Sheep, Integrale, Mental Disorder, Emergence and then the wacky, obscure styles of techno and electronica. More labels on their roster would help.
Blackhole have suffered recently from what I can see, through their strong association with Submerge (Submerge releases have been notably poor of late).
Veto are up and running for a little while and so far so good, the sooner they get more of their own exclusives out the better. Some serious techno and electro action gonna be coming out of this camp.
Intergroove are good businessmen and have both good and bad weeks techno wise depending on what way their schedule runs. They are a bit pricier than others and can lack the 1 to 1 knowledge that other distributors have.