Deck or platform - help!

[PDXnewbie]

Hi
We just purchased a 16' Pacific Yurt. We're putting in our backyard in Portland Or as a spare bedroom.
Our friends helping us suggest we place a deck first, in case we move the yurt AND because we want to build additional deck space next spring. They say trying to build a deck to fit the round platform will be challenging and expensive. Also, if we take the yurt, we can leave a fully intact deck.

Any/all thoughts appreciated?
We'll do Sunwood or cedar decking and a platform with TNG for yurt.

Proposed deck will go from yurt to garage (see 3rd pic).

Thank you win advance!
Regina