But in your case the 5770 in Legacy card and the drivers offered are the last available AMD Radeon™ Software Support for Legacy Graphics Products
As there will never be any newer drivers for your 5770 you would be better off disabling driver update notification.
And iirc the older 15. driver has Catalyst Control Centre user interface, the 16. driver has 'Crimson' UI.
So, should I go for crimson UI or stay with catalyst?
That's subjective..
Though could test one then roll back if you don't like the performance of have other issues.
I have both catalyst and crimson Ui. Would this be a problem?
Yes, it would need to be one then the other, not both.
Let me clarify - I don't know how those are both working together since I'm not familiar with them. There's one version of the drivers that will open a cataylst control center if you want advanced features. This may be what you're looking at when you see both.
The radeon pro drivers do a similar thing, except the control panel is skinned properly.
Early versions of crimson had a sub menu of catalyst functions.
Differences between WQHL and Optional Drivers
AMD WQHL: Low peformance Gaming (50-90 FPS), Improved for Buisness, Editing and dll/etc...
AMD Optional: Improved for Gaming (50-200 FPS), Buisness, Editing and dll/etc...
AMD PRO Edition: Not bad for Gaming (50-100 FPS), Very good for Buisness and Editing or dll/etc...
AMD Legacy: Good for Gaming (40-130 FPS), Non-Improve for Buisness and Editing
AMD Ryzen APU/Kaveri: Very good for Gaming, Improved for Buisness and Editing or dll/etc...
AMD Ryzen 5 4000U/G/GE series APU: Very good for Gaming, Buisness, Editing and dll/etc...