I have old and new Mini 14's and an old mini 30. I prefer them to the AR platform. If you don't need a tack driver they are great. My 186 is 4 MOA on a good day. That used to be the standard for the US Army. My 581 tactical is an honest 2 to 2.5 MOA all day long if I do my part. So to answer your question yes I think the newer ones are better. Are they worth the cost?......that's for the buyer to decide.
ARs are the better bargain by far. But as you say, there is something about the Garand-style action. I have several ARs in a few Calibers, and I have a Mini 14.Overall I would generally go for an AR in terms of practicality. Simply a steady supply of aftermarket parts and accessories at a more affordable price. I simply like the old school style of the mini 14 ranch rifle with it's garand style action and wooden stock.
I am curious as to the performance and reliability of the current production Mini-14 Ranch Rifles.