Wilson better than Thiels?

Yeah, it'll come down to preference - especially considering audiophiles and enthusiasts alike will always differ on tastes.
I used to sell Thiel and Wilson both. I owned a pair of Thiel 2.3's, as I got a good deal on em. Still, the Wilson's through the line are better, but more expensive, IMO.

I like both, but would choose Thiels.

You might want to consider some Thiel 7.0 or higher. A buddy of mine had the 3.6's and then upgraded to the 7.0's. HUGE difference. The 7.0's are overall a smoother more realistic speaker with much better bass.

Hi Samzx12, I am not sure my room 4 x 6 meters(13.5 x 22fts) is big enough for such a big speaker.
As I also owned Audio Research VT100ii, I would like to try a tube friendly speaker for a change.

A much better upgrade wiich should be done no matter what speakers you end up owning is some easy and minimal room treatment. When I added two bass traps behind my speakers and two side absorbtion panels in front of my speakers I never heard a more significant improvement and I go thorugh a lot of equipment experimenting. I don't think you know what you speakers and electronics can do till you at least do some of this minimal room treatment - it effects bass, imaging, coherence, and balance - I think you would be suprised how much better what you have is once you get room treatment. I think it is one of the reasons the Merlin room is always among the best sounding rooms at shows, Bobby understand room treatment extremely well.