For cold smoking the AMNPS5X8 (maze) will be the better choice for cold smoking in warmer weather as sawdust puts out less heat than pellets, but with this smoker it is nice to have the choice of using either pellets or sawdust. The maze smoker can be lit at one end or both ends which ajusts the amount of smoke it put out.
The AMNTS (tube) works fine for cold smoking in cooler temps, but only smokes with pellets. Also, a full tube smoker puts out more smoke than a maze style smoker. With a tube you can put less pellets in it and adjust the amount of smoke.