Hi
When doing landing pages, which is most efficient in terms of time (to produce mobile responsive LPs quickly)? Dreamweaver, text editor or Muse? 
Im starting out, and want to get an idea of which path to go down. I can do basic coding, but it would take me ages to make a page beautiful and fully responsive to every phone/tablet size.
Thanks!
Rod
basic editing: notepad++
making landers: muse
thats what I use 
Same here.
Muse to design the lander, Notepad and Firefox Inspect Element to add media queries, PHP, and tidy things up.
I use Dreamweaver for more complex stuff, and Notepad++ for basic stuff. Different strokes for different folks, so your preferences might be different or change over time. I don't use Muse so sorry, can't help with your last question.
I know a couple people using www.webflow.com with good reviews for boostrap wysiwyg editing.
Muse's code isn't bad at all - you just need to spend 10 s ripping out some on page javascript and unnecessary css from the site_global.css file it makes for the entire site.
I don't think code 'cleanliness' between Webflow and Muse is a deciding factor. Webflow, as far as I know, only allows for static media queries (e.g. desktop, tablet, phone) so isn't what I would call a truly responsive site designer.
Webflow rocks - it's all I use for front end + brackets to fill in the it's very few shortfalls for pretty much every am related use case. You can do some pretty clever stuff with the IX features and knocking out tests take half the time.
Webflow and rackspace are pretty much all you'll need once you understand both tools. There's a bit of a learning curve involved with webflow if you have no knowledge of html/CSS, however the ease of use as far as the ui is concerned + versioning make it simple for most experience levels to get and up and running quickly.
Never used Muse. What is the main difference with Dreamviewer? Is better design with photoshop and coding with Muse or you can also create a nice graphic with Muse?
I use Macaw and as someone new to creating landers, am v happy it
Muse is entirely WYSIWYG.
Dreamweaver is code based but offers live preview and more editing functionality.
If you want to edit landers, Dreamweaver. If you want to create them and can't code, or need to mock up something quickly, Muse.