Runner-up spreadsheet editor: Numbers
Apple's Numbers spreadsheet editor makes data entry easy, especially around numeric, date, and formula info. The keyboard adjusts based on the type of data you're working with. Excel users may dislike Numbers' approach to creating worksheets; Numbers allows several on a page, which can confound experienced Excel users.
Also, like all iWork apps, Numbers supports cloud storage services such as Box and Dropbox, but messily: You must copy your documents via Open In, which creates version issues. Only in an all-Apple workflow does Numbers avoid this messiness, using iCloud to keep your documents current on all your devices. But it does support AirPrint and PDF export.