Kitchen faucet issue - Integrated flex copper supply line

I don't like what you have now because if there is ever a problem with the supply line the entire faucet has to be replaced. If you try to attach a supply line and accidentally twist the copper it's all over.
I'd much rather have the short inlet pipes which are very sturdy. I agree with the idea of buying what works well for you above the sink. The below stuff is one time. The above stuff is every day.