tagor1, welcome to the forum!
If you want to burn your family videos to DVD I would presume that those are invaluable to you, and you definitely don't want to lose the content due to bad media or accidents during handling!
That's why I always recommend in such cases to burn every video onto at least two different DVD media from either different manufacturers or different types from the same manufacturer. Then you can use one of the copies, and you can store the other copy in a safe location.
The reason I recommend two different media types or manufacturers is, that this minimizes the chance of losing both copies simultaneously due to a production problem in a single batch of media.
Using Taiyo Yuden media as one of those manufacturers is a very good idea, because TY media is widely regarded as being among the best media available. The most compatible TY media currently are the 8x rated DVD+R and 8x rated DVD-R media.
For the extra copy of your videos, I suggest using e.g. Verbatim 16x DVD+R or DVD-R media which is the most widely compatible 16x rated media.
Should you worry about +R vs -R media? Maybe!
There is a small percentage of DVD players that don't play DVD+R media, and there's a smaller percentage of DVD players that don't play DVD-R media. Of the DVD players that don't play DVD+R media, most of them will play these media if they are burned with a booktype of DVD-ROM.
In other words the compatibility of DVD-R media and DVD+R media with DVD-ROM booktype is roughly the same, but DVD+R media without DVD-ROM booktype is slightly less compatible with (older) DVD players.
Your NEC ND-3550 can burn DVD+R media with booktype DVD-ROM, but only if you flash your drive with unofficial firmware supporting bitsetting. You also need to change the default booktype to be DVD-ROM after flashing the firmware. You can get such firmware here (e.g. Liggy's ND3550 Bitsetting Firmware 1.06).
If you don't want to mess around with unofficial firmware, you will get the most widely playable DVDs by using DVD-R media.
You can get DVD media with different surface types, mainly those that can be printed upon using an inkjet printer and those that can't. The non-printables are less expensive, bu if you have a printer capable of printing on CD/DVD media and you want to print labels on your DVDs, you can buy the printable surface media instead.
I don't live in Canada, but I have seen many canadians posting that blankmedia.ca is a very reputable shop.