Most popular head casting/chamber design

Do you think any of those are better?
I'm not sure if I would use the word better but I do know that they're real close to the the overall length and head diameter, and they have real skinny stems. After that it's all about finding ones with a single or a double Groove that you can get locks for that fit retainers readily available or at least for the spring we're using.
If you go to engine Pros website and get their catalog of all their valve size listings they offer a stainless single Groove version of one of these valves, I can't remember at the moment which one it was..