Hello Victor, it’s great to hear that you get your dream car! i think it depends on your priorities and preferences.
The 2023 BRZ may superior than 2020 in terms of engine and technology, but the 2020 BRZ just 6200 miles on it, it's basically new and has a significant price advantage over the 2023 model.
If you prioritize having the latest technology and the most powerful engine, then the 2023 BRZ might be the better choice for you, but you need to run out your savings and selling your bike. However, if can save money and still get a fantastic car in good condition, then the 2020 BRZ may be the better option.