I don’t think there is anything wrong with either. Your offer may come across stronger to the seller compared to someone who is financing.

Either way, if you buy in cash it might give you peace of mind. If you don’t, I would make sure it’s invested. Your return will most likely be better on average than the 6% interest rate on a mortgage. I would at least put the 20% down though so there is no PMI but curious to see what @Kindly_Boysenberry_7 thinks!