If you notice a lot of creasing in your sneakers, the likely culprit is the size. Measure your feet and check the size guides for the specific sneaker brands. If you're a 10 in one brand, you might be a 10.5 or 11 in another. Companies sometimes use different sizing, so pay attention to this when shopping.
The best way to ensure you always buy the right size is to record your shoe dimensions, including heel-to-big-toe length, heel width and width at the widest part of your foot, usually from the ball of your foot to just below the pinky toe. Write these down or put them in your phone so you can reference your dimensions when looking at a brand's size chart.
Even if you're wearing the right size, your shoes might still crease because of the material. More rigid materials, like leather, crease the easiest. Flexible materials, like knits, rarely crease because they're designed to bend and flex. If shoe creases really bother you, avoid leather and opt for knit or mesh. Canvas and suede fall in the middle; they're less likely to crease than leather, but they'll still crease over time.