All my demo code is developed in UltraEdit (text editor) on the PC and then I use Devpac v3.18 to assemble on the Amiga.
Use of Devpac seems to be a British thing (the makers, Hisoft, were a British company) as, in my experience, mostly British guys use it.
I am American and I have been using Devpac for all my game coding for many years.
Almost all of the European demos coders I talk to use Asm-One.
I used it for 1 year in the early 90s. It had the best user-interface, very very friendly but it was just to darn buggy (and it lacked FPU instructions) so I was forced to switch to Devpac.
At the end of the day I agree with Joloo - which assembler you use all comes down to personal taste. The code's the important thing - the assembler's just the tool to assemble it...
I agree.
Devpac works great with SASC so I was never forced to switch again.