What is believed to be stronger (i know it depends on position and pieces) but generally what do you believe is stronger 2 of the same (Bishops and Knights) or One of each?

You've answered your own question

Bishop pair strongest

Knight pair  a little weaker

N+B weakest

Generally having a bishop pair is approximately +0.5 pawn compared to a bishop and knight . However this depends as you say on position

Thanks very much for that TalFan very much appreciated

it also depends on your position but I strongly agree on bishop pair is strongest, but 2 knight is weaker than N+B. N+B+K vs K+Q is 25% draw.

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Bishop probably but also depends on position. Bishop pair is strong when the position is open, while Knight is strong on closed position. Maybe?

It depends on position, but, otherwise, I believe Talfan's Comments are correct.

I have to disagree strongly.  Knight pair is fair and away the worst.  Knights get in each other's ways, there is nothing gained by a Knight pair whereas a Knight Bishop pair a great combination.  You can abuse advanced posts with the Knight while keeping long distance pressure with the Bishop.  I don't know how you could think a Knight pair is good compared to the other combinations.  One of the fundamentals to success in competitive chess to deprive your opponent of his Bishop pair if there is an open or semi-closed center.  Trading Knights for Bishops is universally known as trading up for a reason.  I've never heard anyone say the same about two Knights.

Don't make those generalizations.  Depends on whether the board is open or not.  Two Bishops can dominate Knights in the endgame, but those Bishops can bite the dust if they are not active.

I agree more with Fresh than with TalFan.  So all things equal (the average position), bishop pair > B-N combination > knight pair.