I have owned both! In my experience, they are very, very, similar.
My first savannah monitor i tong fed, and even clicker trained at one point, and got it to know me very well and has been a joy to keep. (Still have)
My second sav i got as an adult to form a breeding pair (so far, very successful). But because of this, it got him as an adult and have not been able to get him to know me as well, so hes a complete jerk wad. (Still have)
About 2 years ago, i got an argentine b/w tegu from a friend and it was not in the best of conditions. I tried my hardest to get it used to me, but it was just being uncooperative in general so i had to get rid of it.
About a year later i purchased a few month old tegu. It was a complete jerk wad. It was very healthy and grew more than a foot in less than a year, but i ended up selling it to focus on my monitors.
In all honesty, go with which ever one you think looks cooler, but make sure you give the proper care for either. And make sure you have the time to spend with them so they dont end up as evil beasts.
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