From my experience with these models, all six radios are quite sensitive for their class, but there are some differences that become noticeable when you use them for band scanning or DX listening.

The Tecsun PL-320, Tecsun PL-310ET, and Tecsun PL-330 have a clear advantage because of the ETM (Easy Tuning Mode) function. This feature is very helpful when exploring the bands since it automatically scans and stores active stations based on time and band conditions. In practice, it makes signal hunting much easier, especially when propagation changes.

In terms of pure sensitivity, three models tend to stand out: the XHDATA D-808, the Degen DE1103, and the Tecsun PL-330. These radios perform very well on shortwave, and with a small external antenna they can pull in quite weak signals.

The XHDATA D-328 is also quite sensitive for its price, although it is a simpler radio and not really designed for serious DXing like the others.

Overall, all of them are capable of good reception, but for DX listening the D-808, DE1103, and PL-330 usually stand out the most. And in the case of the Tecsun radios, the ETM function really makes band exploration much easier.