I'm going to assume you're talking about girth & length in regards to penis size, here; if I'm wrong, please correct me!
There really isn't a "better" when it comes to any aspect of penis size or shape. Some people have preferences for a certain girth or length but many people either don't, or their preferences are very mild.
If someone does have a preference for the size or shape of a partner's penis, that preference might be influenced by factors like what kinds of sex they're interested in and what sensations they enjoy, so we can't say there's one universal thing that people prefer or find feels better.
And preferences aside, all that tells you is what one person likes; it isn't a value judgment on any one penis, if that makes sense.