Suggest trying them both, and see which you like.
No suggested amount:
[image: acwedonate.png]
Suggested donation: $19.75
[image: acwedonate1975.png]
With no suggested amount, you have to choose "Request" or "Send" and then
login to your paypal account.
With the suggested amount, you bypass the first screen and go directly to
your authentication and select the payment source (much fewer stepping
process).