Welcome fellow Canuck!
I think that the L3400 and the CK30 are very evenly matched. I don't think that the few extra hp on the L3400 will let it do any more PTO wise. The loader and 3pt capacities are evenly matched too.
i wouldn't let the the difference in weight sway me one way or the other. There is more to metallurgy than just the weight of the steel involved. Either will need proper ballasting in order to use the loader to its limit. I have my tires ballasted. I wish I had my tires loaded from day one. Got it done about a year after I had my machine. Both will safely lift about the same load once ballasted appropriately.
On the 3pt hitch jerkyness - mine has the upgraded valve which they started putting in around 2005. I could not tell any appreciable difference between the jerkyness of my valve and the CK30 that I have tried out. It seems that a jerky 3pt valve has emerged yet again but since you are armed with this information (check out Harvest Moon's thread with part numbers), you can make upgrading to the non-jerky variety a condition of sale.
Once you throw a Pat's or other quick hitch on - which you should - regardless of which machine you get - I don't believe that the telescoping bottom links make any difference at all. Can't get much easier than that.
One real nice thing that the CK30 has got going for it is that the factory remote setup is nice and clean with hard lines. The L3400 does not have a really good factory remote setup. The so called factory setup is not much different from aftermarket Prince SV valve spools - this is what I have.
I would get a QA bracket and QA compatible bucket - regardless of which machine you got.
$3k is a fair amount of price difference for tractors of the same capability. There is no doubt that if you do re-sell then the Kioti will get you less in return and may take longer to sell - depending on how well it is known where you are. That said, you will also be paying $3k less upfront. So this might be moot.
Where abouts are you located? Some weight should also be added to who the dealers are around you and how many of them for each brand. On a brand new machine, you should not need much more than parts or filters but if you have an exceptional dealer of one brand vs the other - that should be taken into account too.
Around my area, I'd say that the Kioti dealer is superb. All the Kubota dealers are so so. If you were here, I'd guide you to the Kioti dealer. The user jimmyj who is around this area was looking at the same machines, ended up with the CK30.
From a capability perspective, I really do believe that both these models are a wash. I would rate ergonomics high on your list.
All of this said, I think that you should strongly consider the Kubota Grand L3240 with the LA724 loader. This is in particular if you are swayed towards the L3400. I have an L3400 and although it is a solid machine, the Grand L3240 - particularly with the LA724 loader, provides a lot of additional value - e.g. 1.4 x the loader capacity, additional 3 pt capacity, HST+ - for not much more money. I REALLY liked the Grand L that I demoed recently. I think that the HST+ is really awesome.
Good luck with your decision. Wish I was tractor shopping over again!
I'm in the SW Georgian Bay area of Ontario.
I must admit that I'm leaning toward the Kioti as it seems to be a better thought out machine (much to my amazement having been a long time Kubota fan)
The tires on either machine would be loaded.
Definitely I'd be getting the QA bucket - until very recently this was a strike against the Kioti as they didn't offer one.
Maxwell Farm Services is the Kioti dealer closest to me. It's a small outfit, but they seem to have a well organized service area. The Kubota dealer has been established much longer, but I get the sense that they aren't really going too far out of their way for my business.
I'm sure that the Grand L machine is better - but I'm reaching my limits here. If i was using the machine for business I'd have no second thoughts about making the leap up, but the reality is that it will be a personal use machine and, as a result, I'm willing to make a few compromises. I also like the simplicity of these two machines - they dont have the layers of electronics found on the Grand Ls or, say, the Deere 3X20s.