Pick your website for betting with the biggest welcome bonus
Nice advertising strategy.

But if you aren't new in that casino anymore your goal to gamble in a smart way isn't applicable anymore because the bonus is already done and you can't the welcoming bonus anymore. The smart way to gamble is to know that you are ready to gamble and you have been prepared on any consequences that you may be getting through when you gamble, it's either win or loss.
If I remember correctly some people told me that welcome bonus and all bonus is not really going to help us win. It will lock our deposit so we will be forced to spend time in the site. If we play long enough then we might be able to withdraw it if there is anything left to withdraw. I havent win anything either playing normally or with bonus so that idea is wrong