Elite 8 Active has a higher IP68 rating for better water and dust resistance compared to Elite 4 Active's IP57 rating. It also cancels out noise 1.6x better than Elite 4 Active. Another advantage it has over the Elite 4 Active is Bluetooth Multipoint, which allows you to connect to two devices at once.
The newest earbuds may not always be the one you need. Sometimes, the older models may be more cost-effective and good enough for your needs.
Jabra Elite 4 Active Review: Sleek Design, Tough Build, Stellar Performance, Great Price
Jabra Elite 4 Active review: small, light and energetic wireless earbuds
Jabra Elite 4 Active earbuds review: ANC for much less than AirPods Pro
Jabra Elite 4 Active In-Ear Bluetooth Earbuds - True Wireless Ear Buds with Secure Active Fit, 4 built-in Microphones, Active Noise Cancellation and Adjustable HearThrough Technology - Navy: : Electronics & Photo
Jabra Elite 4 Active review - Waterproof in-ear headphones with high-resolution audio - Reviews
Jabra Elite 4 Active review – Pickr
Jabra Elite 8 Active Review: Drops Don't Hurt 'Em - CNET
Jabra Elite 4 Active Review: High Performance at Half Price
Sports earbuds with powerful sound & ANC