The spread has nothing to do with it. Everything depends only on the volatility of the trading pair. If a pair has a spread of 2-3P., and it goes back and forth 10p, then it is much worse to PIP on it than on a pair that has a spread of 5P., and it runs in a flat of 80-100P. back and forth. Of course, you need to look for a broker with the lowest spread for the selected pair, but the spread on different pairs does not have much effect on the PIP.