Like-for-Like or Options for Shimano CS-HG31-8?

OK looks like a couple of the rings on my cassette are worn! I'd had some small slips on one, replaced the chain with a new one at the weekend, and now one of the gears is unusable, and another is slipping.
I have Shimano CS-HG31-8 hub currently. Is it best just to replace like for like, or are there other options?
I have Shimano CS-HG31-8 hub currently. Is it best just to replace like for like, or are there other options?
Cannondale CAADX Tiagra 2017
Revolution Courier Race Disc '14
My Strava
Revolution Courier Race Disc '14
My Strava
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Thanks - I'll double check, but fairly sure it is the chain slipping. Also when I look at the teeth on that ring you can see they are worn compared to the others. I think I have a tendency to grind rather than spin as well...
Revolution Courier Race Disc '14
My Strava