Yes, I also read reviews like that, but I never had that problem. Usually brands have their sticker mark to show that it’s theirs. Sometimes the color of the packaging can be off. The formula of the product might not be a good as the real one. Hope this helps. ^^
Well, both offer free shipping. Shipping time from cosmetic-love is a bit faster than Beautynetkorea by a few days. (from past orders) Cosmetic-love prices are a bit higher than the actual price and Beautynetkorea has cheaper prices than most sites. But then again, it all depends on what you’re buying. I saw a few items on cosmetic-love that are cheaper than the prices listed on beautynetkorea. Beautynetkorea also has 1+1 items which can save you about 10%.
Overall, I recommend beautynetkorea because they offer cheaper prices and have sales that lasts a very long time. I only shop at comestic-love when they have sales, but sometimes those sales only make the prices equal to other sites that also offer free shipping. :(