What video resolution is best?

I shot video's on my Samsung Galaxy S7 Edge (in vertical mode, not landscape) and paid no mind to what the video resolution was. I then converted the mp4 videos to avi and but them to dvd disc but when i watch the video's on my widescreen tv the top and the bottom of the video is out of shot. I tried altering the aspect ratio on my tv but it made no difference. Now i have a program on my laptop that converts video's to all formats, It works great but i have no idea what resolution to convert them to so all of the video is on the tv screen & not just the middle! Please can someone help me? What resolution is best to watch phone-made video's on a widescreen tv? Thanks.

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