Market making firms - Comparison

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I am currently looking at several market making firms like Optiver, IMC, All Options, Tibra, Liquid...Based on the information on their website, they all seem to offer pretty similar training, benefits etc. I found it hard to find much additional information and was wondering if there are any significant differences in between these companies in terms of reputation, compensation, training & development, career prospects and so on...

I would greatly appreciate if you could share your knowledge and experience!

Thanks for your help!