3
It isn't a secret that K13 is the best GEDmatch calculator available to us. K36 is also within the same league. You can see how K13 works significantly better for you than K15 by checking the distance to your ethnicity. The K13 model gave you a distance of 4.05 to Romanian, while K15 8.61. The shorter the distance, the closer one is genetically to a given population. With you being Romanian, it can be easily noticed that K13 works better.
K13
1 Moldavian 4.15
2 Serbian 5.94
3 Romanian 7.65
K15
1 Moldavian 5.69
2 Serbian 5.85
3 Romanian 6.88
However, instead of using the default references from GEDmatch like above, I suggest learning about G25 Vahaduo, since there are regional references available there. So for you as a Romanian, that Romanian reference from above is broken regionally, making the comparison more detailed.
http://vahaduo.genetics.ovh/howtouse.htm
http://vahaduo.genetics.ovh/k13-vahaduo.htm
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