Depends if you want to be strong or useful. The Rinnegan only causes destruction. Once you are determined as the source of this destruction, you will be labelled a terrorist. But what's the value of destroying matter? Yes, it is fun on the other hand to play out such powers, but the value isn't high. With Obito's eyes, you can teleport to any location of the world (and even another dimension), phase through objects and be immune to any physical harm. That means nobody would be able to ever catch you. With Genjutsu, you can either show people false images to manipulate their connections or control them -> controlling politics from the shadows. And now imagine. You sit at home and now you just decide to teleport to the white house and put a control on the president. Or control those who are behind the president and become the one pulling the strings. The Rinnegan merely controls dead bodies. Genjutsu controls peoples mindset. Thus, Obito's eye becomes the most useful thing.
And don't forget that the Sharingan also gives you access to Susanoo. Depending on who is wielding the Doujutsu, it is more or less powerful. If we consider the peak of the Rinnegan, we consider Madara. If we want the peak of the Kamui-Sharingan, we can consider the perfect Susanoo as well, which is a flying, mountain busting entity of titanic proportions which can use Kamui shuriken. This is, if you want to consider the destruction as a part of the value. That would be the cherry on the cake. Though even without the perfect Susanoo, for the real world, Kamui is absolutely perfect.
But yes, Rinnegan would be hella fun.
