Tables are not easily controllable in epub. Columns will be as wide as the largest item in the column, so you have to shrink text.
Trying to center them consistently is a ticket to insanity. When I can get it to work, it knocks out borders unpredictably.
Sigil works fine and there is no reason to change. Calibre's editor will work in devices, but if you want to publish for pay it is a whole different story. You will probably have to put up with something like obnoxious epubcheck in any case. Lots of info and a lot of nitpicking stuff, but the publishers want to automate the process, that's what you have to deal with.
If you aren't publishing for pay, calibre's editor is more tolerant of junky epub conversions and doesn't require everything to be good all the time. One thing about the calibre check book is you must run it over and over until it finally says no errors.
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