Hi @SWenn.1 ,
the threshold can be set on both the mentioned devices.
For the LSM303AGR device, you can simply enable the axis and the direction for the threshold crossing, by configuring the INT1_CFG_A (30h) and the INT1_SRC_A (31h), and setting the desired threshold value in the INT1_THS_A (32h) register (see the datasheet from p.53).
For the LSM6DSM, it is a bit more complicated, since the configurable threshold depends upon the specific application you want to implement: you have a threshold for the wake up (WAKE_UP_THS (5Bh) register), one for the orientation/tap (TAP_THS_6D (59h) register), one for the free fall application, one for the tilt detection, etc. See the datasheet from p.96.
You might refer also to the C driver examples on Github for the configuration of the --> lsm6dsm_activity.c.
So, coming back to your first question, if you are just interested in detecting the crossing of a threshold, the LSM303AGR might be more suitable, otherwise if you already know the specific application, you should be oriented on the LSM6DSM device.
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-Eleon
