The main differences are - 1. boAt Nirvanaa 751 ANC has Bluetooth v5.1, 750mAh battery capacity, 65 hours of battery backup, and an ASAP charging feature (10 minutes charging = 10 Hours Playback). 2. Infinity JBL Glide 4000 has Bluetooth v5.0, 1000mAh battery capacity, 50 hours of battery backup, and No ASAP charging feature.