As someone who has been a buyer on Ebay for 10 years and buyer on AliExpress for 3 years - with at least 200 items bought from both sites, I can tell you that I know what I'm talking about:|
When it comes to AliExpress, it's safe to buy stuff if the value of the item is below 100 USD. Small stuff is ok to buy from AliExpress but more expensive stuff is a big risk taking.
Their customer service is infamously throwing around the buyers to different staff members to delay everything. One staff will tell you to wait, another will do the same thing. Basically, they are "toying" around the customers all the time.
Basically, on AliExpress, you are hoping that the sellers are honest to you and help you out whenever you need help. If the seller is stubborn and refuse to help you, you will have to beg to God to help you then cause AliExpress customer service are very unreliable.
Now, Ebay - on the other hand is a totally different story(!) They are almost always on buyer's side and they are always there to help you. A few years ago, their protection was even called "Buyer's protection". I guess that irritated so many sellers on Ebay and that's why they had to change that name to something else.
The only problem is that most of the stuff on Ebay are more expensive than Ali but you get what you paid for.
Ali is like a Chinese mafia siding with their sellers but it's cool to buy from them if you are buying smaller electronic stuff like for example fast chargers or any smaller gadgets, no problem.
But putting my 300 -400 USD into a website that doesn't offer paypal? Though, I actually did a mistake to order my Chuwi Hi12 from there and I can tell you the process to get a replacement took months, maybe even close to half a year and I was even lucky to even get that thing done.
I promised myself from that day to buy expensive stuff with at least some paypal alternative.