I'vo owned both makes of trailer in my time and I miss the SBS. Over the years I've serviced quite a few trailers and the overall level of quality I woud say was 10% in favour of SBS.
My SBS was an excellent bunked trailer that had a group of 8 rollers at the back to facilitate Launch recovery. I believe it was the RB4-3500.
I believe that SBS use Knott axles and Indespension use Avonride both of these makes are fine.
Tow coupling SBS I think use and Knott coupling and indespension use a triplelock coupling for which you need to be a three handed SOB to operate properly or in my opinion safely the locking mechanism seems to fail on these quite frequently. N.B. the safety comment is aimed at a large boat and trailer because you need t have two hands on the triplelock it's very difficult to control the jockey whel to lift the boat of the coupling
The indispension roller retention system is flawed see post about rollers by JSP. that's caused by a design fault square sided axles. When the roller falls off the roller axle gouges the hull..fkkn indespensin brackets are here http://www.indespension.co.uk/b2c/ap...5=NA045&slnk=1
...lovely sbs brackets see here http://www.sbstrailers.co.uk/accesso...t.asp?m=2&c=38
I'n not sure of the stub axle fittings used on the Avonride but on the SBS you can swap em with a big Allen key and a torque amplifier (scaff Bar). Handy if you are in trouble a long way from home
Bearings. One uses sealed bearings and the other uses ordinary Ball races. For self maintenance I prefer ordinary races. for convenience I prefer sealed bearings. SBS uses sealed bearings
Also I think SBS are a bit less cruel on spare part prices, but that's just the diference between cruel and very cruel.
Othe excellent makes of trailer I have owned, especially bunks have been bramber and the less well known Parrimore which are very excellent builds or if you have a taste for the exotic then REBA make the best trailers in my opinion
For the record I don't see a problem launching/recovering on bunks and I certainly think they give the boat a kinder ride although with an Artic that shouldn't be an issue
One other thing about SBS , and it works for me, is that they only make boat trailers apart from a towavan thing