Which is better, a stationery bike or rowing machine?

I've got a stationery bike. It's broken & not worthy of getting it fixed.

I hardly used it as my knee always clicks when cycling.

I don't know whether to get another exercise bike or a rowing machine.

My friend has a rowing at his house & I enjoyed it more than the bike.

I'm want to lose belly fat & know both have benefits.

Which is better to get? The stationery bike or rowing machine?

Thank you

Which is better, a stationery bike or rowing machine?
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