Selling my precious primary residence or not

[Linus Cui]

I bought my first primary house 6 years ago, and two years ago I bought another one and moved in as primary residence, and the old one was rented out, the rent is just enough to cover my mortgage. It has appreciated about 200-300k during the past few years, it is time for me to consider if I should sell it now so I don’t have to pay the tax for the appreciation or just hold it and rent it out .

The areas is in Bothell, Kenmore area in Washington.

I would like to get advices which option would you choose and why?

Thanks a lot.