The simple understanding is that XTC is professional and ATX is amateur.

Around 4000, recommend the one that suits you best: 20 12 XTC? 758。

Description: It has hydraulic lock front fork, Alivio+Deore27-speed transmission system and hydraulic disc brake, as well as beautiful appearance. Two colors are available. Attached below is a picture for your reference:

If your budget can be more generous, there will be better recommendations for you. Go to the store and see for yourself ~