Its all about the personal preferences, some people would like to make a bonus spins because there's a chance getting the jackpot at the highest price of the game, well its ll about the luck with that mostly of course slot games is the ideal for this kind of game. For the RTP its ideal for the large amount of wager such as in the event of the leaderboard highest wage of all time for a day, week or monthly base they gained profit by doing this kind of activity of course to the people who does not play large wages. I prefer with the Bonus spins.
Bonus spins sounds always nice, but I never heard from anybody who wins a lot of money from these bonus spins. For years I am eagerly jumping on any new promotion that gives away bonus spins. They are fun to use, but my profits are usually just 0.1-0.3$. It makes sense for casino to only give away small amounts during such big promotions. Just wondering if there is someone who manages to score big with them. On paper playing at a casino with many promotions looks very nice, there is always free stuff to collect and keeps us gamblers engaged. That is probably also why I prefer to see new promotion campaigns rather than just plain games with good RTP. But for our profits it is probably better to play on casinos with high RTP games. Getting higher wins on average will likely offset the money we could have gotten from free promotions.