Black to move but unsure of the pieces that would give black a better advantage. Any help would be greatly appreciated.
r5k1/pp1qpr1p/3p2p1/2pP4/1n2P3/1P2N1Pb/2PQ1P1P/3RR1K1 b - - 0 1
Black has an overwhelming advantage and should win easily. Being up by a whole piece is a huge advantage that basically can't be overcome by purely positional considerations.
The most straightforward way for Black to win is to try to trade pieces and end up in an endgame where he has one piece to White's zero; a win at that point would be trivial.
He could also try for a kingside attack, since White's light squares are very weak.
The above position is 100% won for Black-White will need a miracle to scrape a draw, not to mention win!
How do you win this?
The best rule in a won position is to destroy the opponents counter-play.
Here White has no counter-play whatsoever, but could try something with
I would start with
Remember, when you are a piece up always exchange pieces but avoid exchanging the pawns as this helps the weaker side to achieve draw.
After that, Black needs to improve the position of the weakest piece in his setup-here it is knight on
After reaching this setup you will win by a tactical sacrifice.
Here is a sample line that could illustrate how things would go:
This example contains some highly instructive moments. Pay attention how Black limits White's counter-play and how he constantly improves his inactive pieces-his knight, rook and king. Once he activated all of his pieces, tactical blows came naturally and Black was able to win effortlessly.
In a won position your main goal is to suppress all active moves your opponent has. Once you do that, your decisive advantage will "kick in" eventually. You see, once your opponent has no counter-play all you have to do is improve the position of your inactive pieces and the rest comes naturally.
This was just a sample line-I have no space to analyze all possible continuations but by following my advises you can learn on your own how to win this position.
If you have further questions leave a comment.