Along with either of those two programs for your out-of-town management of spreadsheets, may I suggest Dropbox?
It's cloud storage and it's free for the first 2GB. With it, you can put that Excel spread sheet up "in the cloud" from your home computer, download it later to your iPad, make your updates and then re-store it back to the cloud (with the changes) for access from anywhere that's Internet capable (or from your home computer or the iPad...again).
Dropbox makes traveling easy because you can keep your stuff up-to-date while on the go. Plus, the app (and home computer program) are free.
Just a thought...
Marilyn