Comparing LAS data to TIN data

[NellHansen]

I am trying to calculate the vertical difference (delta Z) between an LAS dataset and TIN data to test different data collection techniques. I am trying to avoid converting the data to raster for the comparison. Is this possible? Maybe using a multipoint feature? I have tried searching for an answer but may be looking in the wrong place.

[JeffreySwain]

The natural conversion of the LAS data would be to a multipoint file. With the Multipoint file, you could then create a terrain and compare the Terrain and TIN.  What might be preferable, but difficult to manage would be to convert the multipoint to a single part or individual points and then use the Add Surface Information tool.  This will add the z value of the of the TIN to the point.  From then you could compare the values.  I am not sure what you are looking to get out of this analysis.  Generally speaking, the las data should be certified to a certain vertical accuracy and is usually collected at a finer resolution than the TIN would have been.  You could probably see this with a simple visual comparison of the Terrain compared to the TIN.