New wheels for old bike, or new bike?!

Hi All

Please can you offer some advice?

I have 2011 Giant Defy 2 (Alloy frame, 9sp Sora groupset) which I use for a 13 mile each way commute. It’s all working well and I have recently replaced the chain, cassette and rear mech.
However, the rims on the original wheels have now worn down beyond the wear markers so new wheels are needed.

First question is what wheels would you recommend?
I will fit 28c tyres which is the maximum width I can fit through the calipers.
The Cero AR24 seem good value at £189 and would be a lot lighter than the originals, but maybe not as robust?

Second question is do you think it is actually worth spending more money on such an old bike – maybe it’s better to put it towards a new bike?
I quite like the idea of hydraulic brakes, 1x and wider tyres and I see Planet X are selling their old XLA and XLS cyclocross bikes very cheap at the moment eg XLA Rival 1 for £600. How would this ride compared to the Defy?

Let me know what I should do!

Many thanks