Pixel 6a came out in july for 450$. It went down to 300$ for Nov-Dec. I would assume the same for Pixel 7a. But you will have to wait some 8 months for that.The 6 series generally have minor touch (not registering) problems all over the screen. The 7 might not. I personally liked the 6 look better than the 7. For me price was the big factor. big difference in price may not justify the jump from A to regular series.
A whole bunch of factors for you to decide.
Between the 6a and 7 I chose 6a because of looks, size, weight, and the big price savings.
Think about how long you want to have the phone. If you wanna have it for 5 years, might you prefer to have the better hardware for that period even if it costs more.