Aligners and braces present different challenges when it comes to hygiene. Braces are fixed to the teeth and trap bits of food, which makes some areas harder to clean. Keeping your teeth clean with braces takes more time and calls for extra types of toothbrush.
On the other hand, aligners cover the entire surface of the teeth, and saliva circulates more slowly underneath them, which can encourage plaque to build up. In addition, if you are not able to clean your teeth after eating before putting the aligner back in, plaque can stay on the enamel for longer.
According to research, there is no significant difference in how often white spots and decay appear with braces compared with aligners. In both cases, hygiene is crucial. Even so, cleaning your teeth is much easier with aligners.
This answer is for general information. Your own case needs an examination by an orthodontist.