I guess most of us seems to confuse between tyres, rims and which one to go!
Don't change your rim size unless you know what you are doing. This will directly impact suspension setup.
Some of the brand top cars do give higher rim size. If suspension parts are same for lower model vs high end model, it's safe to upgrade. This is not true for luxury or performance oriented cars. They do have different suspension parts for top end variant.
Is it worth to upgrade my rim size? Unless you are driving performance oriented car or by upgrading to higher rim size, you are getting too good tyre (better brand/performance/comfort), it's not worth at all and remember higher the rim size, pot holes damage your car more. Upside, if you get better tyre, the handling performance increases drastically
As mentioned earlier, there are multiple types of tyres exist (comfort, performance, long running)
Typically Bridgestone/Apollo/MRF and other brands offer hard wall compund tyres. These tyres take lot of abuse and runs for miles. Downside, they deliver performance nature
All performance oriented tyres are soft wall compound tyres. They are perfect for high speed cornering to better breaking. Downside, they dont run for long and can be noisy. Potholes can easily damage them and pricey.
Comfort oriented tyres offers blend of long running and smooth riding. Best of both worlds, master of none