So I don't own either of them however I do have hands-on experience with both through my job; my company use to give iPads as the gift in customer giveaways at trade shows but recently switched to the Galaxy as the Galaxy has a built in flash player which means our website will on it but not on the iPad.
That at the moment is probably the biggest failing of the iPad right now, however web sites are starting to move away from it, Microsoft are working on their own equivalent so long term it will become less and less of an issue.
Android is favored because it's so open whereas Apple have always claimed they will never release any opensource technologies but Apple iOS is favored because it's so polished and stable.
Both have an AppStore, both claim large numbers of apps but really how many of them are actually useful.
The Android is definitely more hand-held but if you have an iPhone it isn't much bigger, my hands are a little on the large size so I prefer the iPad but that's a personal thing.
Neither one has the file system you are looking for, you can probably get some sort of viewer, Word / Excel / etc, from the AppStore but something like your schematics if you use a custom software tool you are going to have to go to them to see if they on releasing an app for either device.
My current favorite is the Motorola Xoom because for a tablet / mobile device its so powerful, I'm also a big fan of the BlackBerry PlayBook which has a similar sort of processor and RAM to the Xoom, the price for the PlayBook is much cheaper than the Xoom but it's a RIM device so has limited functionality because they dont allow many people to develop Applications.
So I'm sticking with what I said to you yesterday, take back the iPad and wait for iPad2 which is supposedly going to be out in the next few months, it's meant to be thinner, have camera / facetime capabilities, super high-res, faster processor. It will probably cost more but it will be sweet
