What a codec actually does
A Bluetooth codec compresses audio so it can travel reliably over the wireless link. Different codecs balance bit rate, stability, latency, and power use. The best option is not always the one with the most impressive headline number.
SBC and AAC cover most people
SBC is the basic fallback and can sound better than its reputation suggests when implemented well. AAC often works especially well in Apple-heavy setups. For many listeners, fit, tuning, and driver quality matter more than the difference between these two.
aptX and LDAC chase different goals
aptX families often focus on lower latency or stable quality. LDAC aims for higher throughput, which can help with detail when the connection is strong, but it may step down to maintain reliability. Marketing often hides that tradeoff.
Check real behavior, not just the logo
If a wireless set feels delayed, compressed, or unstable, measure what you can. The latency test is a simple way to compare how different devices and codec modes behave in practice.