I would say get both, they are both great and having both will give you the best selection of HD movies. I would recommend two single players over any current combo player.

If you want just one or a place to start, even though both are good I would say BluRay has the better players and pricest as well, while HD DVD has the lowest prices so shop by which of these is most important to you. You may also want to compare movies available on both formats and let this help you decide.

I have a Panasonic DMP-BD10A BluRay player right now and I am sure I will soon also have an HD DVD as well. Both formats are excellent for high def movies, but in the near future I hope to add a BluRay burner to my computer. BluRay will be much nicer for a computer recordable DVD as it is 50gb while HD DVD is a smaller 30gb.