There is no best head.
There are cylinder heads that will work better in certain applications than others will.
I suggest to stay away from the bigger is better ideas of what head flows the most and is bigger.
There are 24 degree conventional heads for the Bb Chevy that are awsium and willl produce tons of power at racing levels of 2,000 hp. That is with a lot of extra porting though. At those power levels no matter what you start with they requre lots of work.
Most of the cylinder head mfg offer different sizes in their popular heads for a reason and that reason is to try to fit known different applications.
There are no valvetrain reliability issues with eiter the many spread port designs or the aftermarket conventional designs if the higher quality components are used. You will not be able to use just regular quality studs and rockers with any head except for those made for lower powered applications, to my knowledge.
There is power to be had with more stable valvetrains but they do cost quite a lot more money.
Reliability is not an issue. Cost of the components are the issue.
I do not insist on T&D (my preference) or Jesel on everything I build. I usually do strongly suggest them in major power racing applications, or in certain engines. I just recently completed a 602 cu n Ford that we were stuck with using stud mount rockers becuase of the budget and it is a 1,500 hp nitrous enging. Hp is estimted based on the nitrous it is designed to handle vs dyno N/A power. I would much have preferred to use T&D shaft rockers and I know we would have gotten more power.
As someone mentioned, Lifters are an issue of reliability when the power levels go up. When we use professional springs the common garden Crane, Comp etc roller lifters are out of the picture. We need better. Better is more money. In most applications the very high dollar Jesel and LSM is not needed, in my opinion, but the Speciality lifters are.
Sorry I still am not recommending any certain cylinder head. By what I think you are talking about many of the conventionals should work ok. Don't go for the big runner ports with high flow numbers though.
The problem with asking and receiving internet tech advice is you receive at times very good advice and at other times bogus advice that sounds good to the advisor but is not real world. Bigger in cubic inches is better, usually. Bigger in heads cams etc are not always better.
Ed