If you don't develop a good stroke. It might make you think you need an aiming system. No idea if aiming systems work or not. Just believe your better off finding ways to test your stroke first. Maybe someone could put together an A to Z step by step process to test or master this before you go to that. Test how straight your stroke it with center English. Pass. Test your stroke using side spin. Pass. go to the next step and so on.
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Once again OP it's not an either/or proposition.
People TRY to frame it this way but a good stroke is a REQUIREMENT for playing pool at any decent level REGARDLESS of how you aim.
A bad stroke, an inconsistent stroke, bad physical habits are all things that detract from having consistent success at the table. People miss a lot of shots that they should make BECAUSE of these issues.
So regardless of how you decide to pursue aiming a good stroke is essential to get the best results out of being on the right aiming line.
What MODERN aiming systems do for you is put you on the dead nuts PERFECT shot line for centerball line shots. That gives you a dead nuts perfect BASELINE to work from. When you then need to use sidespin it makes it MUCH EASIER to adjust as needed off that baseline. This all happens in a fraction of second once you learn the steps to use to accurately choose the reference points and align to them.
This isn't some magic bullet for your game or a cure all. It's simply a more accurate way to get to the shot line. Good players developed these methods and good players have refined them and good and great players use them. Yes you can get good without ANY formal "branded/named" aiming system but your learning curve will be a LOT longer. Yes, a LOT LOT LOT longer as you literally have to do trial and error discovery for aiming thousands of shots. You can literally improve much faster by investing the time to learn to aim objectively because then you will have more time to spend on the vast amount of nuance that must be learned to get good.
Lots of amateurs have wasted time aiming by feel and going the trial and error "hit a million balls route" only to find that they come up against groups of shots that they just can't seem to master. This is often because when they try to aim by "feel" with no objectivity they actually are seeing the shot line incorrectly. Modern aiming systems FORCE the shooter to adopt the right shot line and take all the illusions out of it.
Couple that with your well developed stroke and you'll be deadly accurate.
OR go with the advice from the 60s crowd and just work on your stroke and hope that the aiming will just work itself out.