Depends on what you want. If you want more features than you could possibly want or use, LEDE/OpenWrt. With some routers (Broadcom and Qualcomm mainly), stock

Depends on what you want. If you want more features than you could possibly want or use, LEDE/OpenWrt. With some routers (Broadcom and Qualcomm mainly), stock firmware tends to perform better since no cooperation with the kernel or LEDE/OpenWrt. For security reasons, you'll want to use LEDE/OpenWrt. KRACK fixes got pushed pretty fast (same day) for example.