Really depends on your taste. Havent used SMOS for while now, as i switched on hiveos and very happy with it. Just in that time when i started to use it was much more advanced. Dont know if SMOS has integrated same main features as hive does, but if they do then hive is always first to update their software with latest features like telegram notifications, aggressive undervaluing, mem tweak tool....etc. Would suggest you to try it out, at start it seems very complicated, but when starting to use its very easy.
I have made installation guide also https://mineshop.eu/2018/07/27/how-to-install-hiveos-and-setup-for-mining/
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Thanks mineshop.eu - I will give it a go later as me "Free Trial" is coming to an end with SMOS (which is fairly easy and straightforward to use)

Anyone have any personal opinion on what to mine with 580's?

I am in the process of saving up now for an NV rig...

Thanks

Anthony