This can help you: https://ijssst.info/Vol-16/No-4/data/8258a205.pdf
and Conference Paper Mininet as Software Defined Networking Testing Platform
https://www.ijert.org/comparative-analysis-of-performance-of-controllers-in-software-defined-networks-using-mininet
In my opinion, it depends on many factors, i.e. it depends on several factors such as: what you want to prove/implement with your research, what is your previous knowledge of SDN controllers, etc.
For example, I have worked with NOX, POX, Ryu, Floodlight, OpenDaylight and ONOS, and my experience is that Ryu and ONOS are currently the best ones. I usually leverage Ryu for fast prototyping/proof-of-concepts, while I use ONOS when I'm implementing a next-step of the previous prototype (something that could be standardized/used by industry, etc.). In particular, in you haven't even worked with an SDN controller, I'd start with Ryu.
Good luck!
I suggest ryu because it's python based. also it supports last openflow versions...
See my paper:
Article Controller selection in software defined networks using best...
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