They both score a 65 as of this post. Heineken: https://www.beeradvocate.com/beer/profile/81/246/ Becks: https://www.beeradvocate.com/beer/profile/32/2435/ /thread
Neither Heineken or Becks is my 'cup of tea'. I found it interesting that Pabst Blue Ribbon is rated higher (69) than these two beers on BA. Cheers!
If they are both fresh and not light-struck, it's a toss up for me, with a slight lean towards Heinie if I have to pick one
I just discovered that I haven't rated either of these. I may have to pick up a couple of singles. For science.
Long answer: bias on this site against macro beers and light-flavored beers. (Except by those sweaty BAers who drink them so fast to cool down.)
BAs that know that they're going to do something requiring a "cool down" think ahead and purchase and chill their favorite Koelsch, Helles, Pilsner, or US or Mexican macro in advance. I can't think of a singular instance where I finished cutting the grass or after a fishing trip and thought "Man, I hope they have Beck's cold at the store."
On tap, I'll take Beck's. It's a passable German pils in that state. That said, I've only run into on tap a handful of times in my life. Bottles of it always seem to be lightstruck, while a lot of the recent Heineken bottles I've had weren't. Therefore I lean in the Heinie direction for bottles. Somewhat related, I think Heineken Dark is pretty damn good and 0.0 is a godsend. Beck's Dark and their N/A = pretty middle of the road.