Both have their strengths and weaknesses:
-Default apps. Why Palm never ported over the default PIM apps to webOS is beyond me. The default stuff was better than many of the apps people buy to replace the webOS default. I know the iPhone mentality had something to do with this but honestly, no alarm for tasks? No agenda view? It was a joke going from the Palm OS PIMs to webOS.
-Chatteremail. Palm bought and employed the developer. This was by far the BEST email client I've used on a mobile device. Again, it's beyond me how Palm had this developer, his code, and talent and didn't try to keep him to put it in webOS. The webOS client is also another step back from Palm OS here.
-Attention Manager. In Palm OS, you had a central notification center. Although webOS has excellent notifications, it groups notifications from the same app together. Some may prefer this, but I don't. In Palm OS, at least emails, texts, etc. would be listed individually and I can decide which to dismiss without going into the actual app.
-Menus. Palm OS had menus which let you have PC like functionality. I have no idea how Palm could switch to the single menu structure of webOS. Similarly, I have no idea why any touch OS can't do menus like Palm OS (tap the top and file, edit, etc. is shown). Scrolling through long menus drove me nuts with BlackBerry and drives me nuts in webOS.
-A BT stack that's actually worth a damn. Sure webOS added AD2P but there's no file transfer, LAN, etc. that Palm OS had.
-Graffiti. Sure it's not as important with a keyboard device but if a slate device was ever released, this would be a cool alternative to swype.
-NVBackup. I can't count how many times this saved me. WebOS has no equivalent.
-Start-up. Thanks to Clean Start, I'd boot-up in under a minute. WebOS on the other hand...
-Multitasking. Although one could use DAs, this in many instances made things very unstable depending on the DA/open app combo. Funny though, since the iPhone doesn't even include DA functionality so again, Jobs is still in the days pre-garnet.
-Connectivity. Unlike Palm OS, which is limited in how many radios it can support, webOS isn't. It was nice to finally get past the 3G limitation in GSM Palm OS devices.
-Web. Finally, Palm got a worthy browser. Problem is, so was Blazer when it first came out and just like Blazer, Palm left it to rot and here we are, using a webOS browser that hasn't changed much since 09. It would have been nice if a web-centric OS would be on the bleeding edge of webkit updates.
-Linux. Although Palm OS was busted open by many talented people like Dmitry, being backed by Linux makes webOS much better to play with than Palm OS.
-Gesture area. Much more efficient than Palm OS in navigating. Shame they didn't allow gesture customization like Palm OS did with the 4 app buttons.
Head-to-head though, both are tied to me. For work, multi-tasking doesn't concern me and DAs work just fine, so my T|X wins hands down. Solid like a rock, ability to take notes and view them in Palm Desktop, etc. makes it a winner. For personal use, having a more current browser, stability, 3G, wifi, and being able to view different apps, all open, is more needed for me. My Pre3 makes my life easier when I need to do things on the go. So much for the zen of Palm bringing everything into one device...