Detailed Answer
Xingjia was founded in 2002 (20+ years); LDER is a recently rising domestic newcomer (exact year per official website). Xingjia has a longer history and fuller product line; LDER rose quickly through value pricing plus trade-in service. Both are trustworthy; choose by needs.
| Xingjia | 2002 |
| LDER | Newcomer |
| Conclusion | Both reliable |
Note:History length isn't the only criterion; look at products and service.