Similarly, I had some domains which had expired for 2 days, and Namecheap let me renew them at no charge. I am pretty sure at GoDaddy the same thing would have cost at least $10 extra(wouldn't surprise if it is actually $90).

On the other hand, GoDaddy renewals are roughly $3 cheaper than Namecheap, because many GoDaddy coupons work for renewals, but I can never find good coupons for Namecheap renewals.