I trade mostly automated. Most trades have about 1-1.3% risk, the trade size then derives based on that. Whether it's 1 or 1.3 depends on the entry criteria, better candidates get slightly more risk.
I also trade some systems that don't have stops at all, for them the trade size is dependent on the profit goal. Those trades are usually scalps and typically small (the entire position size may be 2% of the account size, the profit target may be 0.3%)