Height depends; when younger, we used to play entire epic battles standing up, and kept that up for an afternoon and evening with just a half hour break for pizza (or equivalent). The table we played on was about 100cm high, as it had to fit over my buddy's diningroom table, and I found that height perfect for gaming whilst standing up. But also, sitting down, one had a perfect first person view of the battlefield.
It bears mention that this particular table was sized 240x120cm (8x4 feet), so significantly smaller than the ones you're planning.
For some reason though, we (d?)evolved to playing on tables that were on a more standard height of about 70 to 80cm, so we could sit during the game.
I'm still planning to build my own table (and an elaborate plan it is), which will be about 100cm high. Because I want to re-introduce the standing aspect, but mostly because the space underneath will be used to store the differently themed table inserts (120x60cm each, three elements per theme for a max table of 180x120cm, although I suspect most games these days will require just two elements).
The height is still up for debate, but from a storage perspective, I'm leaning towards the higher the better, while from a comfort perspective, I'd lean more towards a lower one.
So it's really up to how you expect to be using the table. Obviously, for tables with a bigger footprint, I'd suggest keeping them lower, so one can still reach the middle of the table, which would be more challenging when gaming on a taller table...