Steve Litchfield, a man who knows a fair few things about Smartphones, has put the Nokia E90 and HTC Advantage together and written up a very good comparison table that should help anyone looking at these two devices.
For me, its all about the keyboard, the PPI (pixels per inch) and the browsing experience. Steve gives both keyboards 6/10 (although I’d give the E90 an extra point because it looks like it would make a better sofa and bed-surfer,) he doesn’t mention the PPI and on browsers, he says that both devices cant handle flash. I dare say they’d have some problems with many other rich web sites too. Client side processing load is getting heavier these days and nothing in the ARM-processor world seems to be catching up.
Which one would I take? Neither. Both clash with my 3 device strategy of small smartphone (for 24/7 use) ultra mobile PC (for rich browsing, video, better text entry, meeting, sofa, bed and mobile desktop duties) and a desktop PC (for data storage, photo/video work, static office, fast text input and content creation.) No space for an uber-smartphone or notebook in my strategy.
Are you using a 2, 3, 4 or even 5 device strategy? Would these devices fit into it?