Crusher94 it's a fair point to want to use a supplier that has good reviews!
Right now I am only using the US suppliers as they offer much faster shipping options for my customers. Should you be interested you can check out a list here.
However if you're using Oberlo Supply remember you can always use the report a problem feature if you have trouble with any supplier. If there are enough issues they will be removed from the platform (Oberlo has in fact already removed some who were not meeting processing times).
For Aliexpress suppliers they no longer have reviews so I would check the reviews of products. Usually you'll get the same useful information about communication and shipping times.
What suppliers are you using now?