Well, as someone who has had BOTH in my system I might as well give my 2-cents.
Both are very good but I can easily say that the SR 10 SE MKII was better top to bottom. I was not the only one who heard the difference in my system. I had the Jaco and demoed the SR and sold the Jaco.
As far as 'old" tech, BS. That is like saying an amp or speaker that has a new model available is old tech and has no value and sounds bad. The earlier version still sounds as good as it did and at the reduced price is a great value.
That said I would also suggest that if you get the chance try the Equitech line as well.
They come highly regarded by many who have tried them.