Video will be slightly higher (slightly higher bitrate), but the biggest difference is audio - the MKV includes higher quality main soundtrack (lossless, I believe - at least in the cases of SW and ESB) and several more tracks for different languages.
So not REALLY worth the investment in a Blu-Ray burner then? Sound isn’t amassive issue to me as I only play through a sound bar or TV Speakers anyway.
I work in a theatre and got some friends together to watch SW 2.5 AVCHD on the BIG screen. I couldn’t A-B it with the MKV, but I seriously had ZERO complaints. Not sure if it’s worth the investment. Unless you want the extra gigs to be able to have a BR with a fancy menu and extras, etc…
I burned my first Despecialized trilogy just over Thanksgiving off the AVCHD to DVD-DL and I have to say it is pretty amazing (especially when you buy the inkjet printable DVDs and a Pixma printer) which I did just for this project. So just after getting back from Walt Disney World where my kids got to meet Darth Vader, have a light saber battle with him, and I was chosen as the Rebel Spy in Star Tours…I just knew I needed to do this right. I picked up an external USB 3.0 Pioneer BD Burner off Amazon for not a lot, downloaded some freeware, bought some cool glossy liquid defense plus printable BD-Rs and will be testing the burning process from the MKVs very soon. I would go BD Burner - they are really not that expensive, and I can see the drive getting used in the future for other projects.