For me the strongest point of Construct2 is the Event Editor - it's very well thought out, clean and flexible - if you have programming experience you will feel like fish in the water. Stencil's logic editor feels retarded, ultra-slow and clunky after you've worked with C2.
I pretty much don't care about HTML5 vs Native, because I use it strictly for rapid prototyping. I've already prototyped all possible casual and board games with it, and I can tell, you can do pretty much everything with C2.
Another very good thing is a very helpful community and huge plugins/behaviors repository.