This is what I seen from a mobile web apps. Mobile web app sometimes feel unfinished. I would suggest titanium mobile because things like sencha touch don't scale right for android now for ipad. It seems like screens are going to become etter not worst. For javascript developer titanium mobile gives you things native developers use plus you don't have to worry about problem cause by using a mobile browser which still a very primitive compared to app sdk. Until mobile web can give the feel of native apps I don't see android or apple making the mobile browsers better just to undercut there own profit so people can right html5 websites.