They have different objectives. Investors would be elated to be getting 20% annual return. For traders, they can bang that out in a good month. Yes, traders generate more commissions but also higher returns.
But in the long run, they might NOT necessarily generate the greatest wealth. Warren Buffet buy in the hundreds of millions to billions and hold positions for years/decades and let it grow to tens/hundreds of billions over time.
After a certain size, traders have to be a bit longer term. You CAN'T swing around a billion in an out in a few minutes. You gotta hold.
However, with technology to spread out a lot of positions and monitor them in real time and get in and out then you can probably move tens of millions every few minute. But that infrastructure is not really available for retail traders.
But most of us retail traders will not get to that size to be concerned! LOL. If the goal is to kick out a few millions a year trading, then with a lot of hard work some luck and persistence perhaps the top .1% of retail traders can get there.