In my opinion, the most reliable is Amtrak. I've been on Amtrak from Philly to north of NYC during a blizzard and it held together pretty well. I do not recommend bus or any other road vehicle except as a last resort. There aren't many ways to make that full trip, but best of luck!

(I am personally taking Amtrak from NYC to BOS on Thursday afternoon. I fully expect the rails to be operational at that time. If they are not, it will likely be due to some other problem. Such is life.)

Best of luck Hunting (and perhaps we'll run into each other!)