There are two types of players in the bookmakers.. The first ones are amateur players, they just come to relax, have fun and try their luck. Putting 1000 on your favorite team, they fervently “support” for it, without thinking too much about making profit in the long term. Such players never keep statistics of their own bets, do not adhere to certain strategies, do not apply financial management. If you lost money - replenished the balance, and so on in a circle.
The second type of players consider betting as a real way to make money and get a steady income. It is important for them to adhere to the strategy and financial management, plus you need to keep statistics on rates and evaluate your success. Many betters are left with a choice: take into account the ROI or the percentage of profitability, which of the counting methods is the most correct and preferable? To answer the question, it is necessary to examine each aspect in detail and compare their strengths and weaknesses.