the question is too broad
player a could spend 10,000 crystals on trash toons
player b could spend 2000 on top tier toons.
player a would have more GP
player b would likely do better in arena
player a would have a bigger collection, player a might also snag a legendary. ie he had g12 separatists useless in arena but managed to get padme
player b would be more useful in top tier raids
success is relative, and there's also a huge element of RNG especially with mods .