...P.S: I see that price differences especially in low cap altcoin and I think I've actually found one example so I'll share a screen, let me know if this could be a valid example and how would you deal with it.
Each specific case should be considered individually, bearing in mind that a large difference in price may be caused by various factors. These include the fact that there may be very little liquidity on one of the exchanges or the deposit/withdrawal of the coin you are interested in is prohibited.