There is NO ONE RIGHT TABLE.... ever....
It's never big enough - or tall enough - or low enough...
Mine is 4' X 6' - 1/2" thick top... with threaded holes for mounting "stuff" - like 90 degree blocks etc. I also plug welded a angle iron piece at one end - PERFECTLY SQUARE - and etched a line in the middle. The plug welding allows me to pull or push a tape measure.
I would only add that - you need POWER to the table somewhere -- and AIR... from overhead. Also - I would not make it too fancy as far as the top goes... many times I tack things to the table... and grind the tack off when finished. T slots belong on milling machines etc... I would constantly be dropping tungstens in there and screws and nuts etc - that would really pee me off...
STRONG and FLAT and unshakable is a good attribute! Storage under it is also good.... I took the wheels off my first Sears Craftsman 3 drawer tool box - and stuck it under my table. It now stores the consumables.. gloves... boxes of ss wire brushes etc that I use constantly when welding etc.
I have a separate cutting - bending - banging - dirty - nasty table.... made from grates I bought at Boeing surplus... the "stuff" all falls down - and I can use it for spray painting small parts etc... I don't want to get paint on my good table - as this would then hamper my "ground"...