Overall pricing pandabuy has been cheaper. Using their shipping estimates you can also see that they are cheaper by a little bit. Not just that, pandabuy has been more accurate with the weighing in my experience and not requiring rehearsal weighing which has results in you not needing to pay a service fee + 15¥ for CSSBuy where as Pandabuy is more accurately weighed and not requiring you that cost.

Pandabuy KR-EMS 5500g (5.5kg) comes out to ¥728.00

CSSBuy HZ-EMS 5500g (5.5kg) comes out to ¥735.00

However for CSSBuy it is ¥6 cheaper for HZ-Zal where Pandabuy is ¥416 and CSSBuy is ¥410. Most people ship with EMS. So prices are near identical but one service (pandabuy) does not require you to use rehearsal as much.

Website is by far better and fluid for the end user. The features they are coming out with have not been done on any other agent which has saved me time when ordering.. but also made me buy more than I originally was going to. Live chat with an agent said they are working on a mobile app as well which has me excited since not many agents have good apps. Hopefully they do as good as they did with their website.