Qseven is an open standard driven by the SGET organization. Congatec is the market leader in Qseven. It is a well-supported mature standard and used in high volume.  

Qseven supports both ARM and x86 CPUs and is recommended for new designs. 

Qseven can be a good choice if you have space constraints and need for legacy interfaces like RS232, CAN and/or LPC.