Better is a subjective term.
Like you I am also a long time DW user. I started using DW and Fusion about the same week. I even used to
write tutorials for dreamweaver back in the DW 4 days and was a regular participant on the MM newsgroups. I still use DW and have had it installed on every computer I have used.
You just need to use a different mindset when working with both programs.
DW is an enhanced editor (i.e. you can write raw code in it or use the tools to write snippets of code for you).
Fusion is a code generator. You have to use a "finished page" mind set. Any code that needs to be included on the finished page has to be inserted at the location necessary using the insertion points provided.
Neither product has any show stopping limitations as long as you understand the basic design concept of the software.
In Fusion you work on what appears to be the finished web page using the GUI to lay everything out as you wish it to appear. The Fusion product then generates all of the necessary code to display your layout as an actual web page. With Fusion the GUI layout becomes the web page.
With DW the user must create the code using either a directly entry of code or using tools/extensions/snippets etc to create the html code. The code written by the user and the tools used is the web page with DW.
Very different concepts that yield the same results.
As to Fusion's stability. 99.9999% of the stability issues are user induced (improper insertion/pasting of external content into the GUI). The product itself is and has been a stable product. It is the user that induces stability issues through "pilot error".