These prices were checked during the same week at stores directly across the street from each other in West Seneca.
Yes, Tops will have a few items that are slightly cheaper than Wegmans. (This week was milk at 30 cents cheaper and Grapes 90 cents cheaper per pound) But the vast majority of products i checked were 30% to 80% higher at Tops.
Wegmans 12.99 
Tops $16.99
+30% higher at Tops
Wegmans 4.99 
Tops 3.29 (1/2 the size)
It looks like Tops is cheaper, until you see that the one at Tops is 1/2 the size of the one at Wegmans.
Tops package is 8oz Wegmans package is 16oz. So Tops would be $6.58 for 16oz- 30% higher at Tops.
Wegmans $3.49 
Tops $3.99
Tops 15% higher.
Wegmans $3.49 
Tops $4.59
– Tops 30% Higher
Wegmans 2.49 
Tops $4.39
– Tops 76% Higher
(notice the unit pricing at Tops is per pint, Wegmans per quart.)
Tops SALE price is .01 cent higher than Wegmans regular price.
Wegmans $3.49 
Tops $4.99
– Tops is 42% higher price.
Wegmans $1.89 
Tops $2.39
Tops 26% higher.
Wegmans $7.49 for 48 oz of Burgers 
Tops $8.99 for just 32 oz of burgers
Tops is 80% higher than Wegmans.
Wegmans $1.00 
Tops $1.29
Tops 29% higher price
Wegmans brand chips 2/ $4 everyday 
Lays at Tops are 2 /$7 ON SALE
At Wegmans you can get the Name brand for the price of the store brand at Tops.