@March Audio for full featured DSP software, both are best in class. If using digital XO capabilities, Audiolense gets the nod as the time alignment process is fully automatic, and repeatable, whereas in Acourate it is a manual process. Given Acourate's manual process, introduces variability in time aligning drivers, especially for subs, as the wavelengths are so long. OTOH, depending on one's needs. Acourate has more raw audio DSP functions whereas Audiolense has a more automated workflow for most common use cases, including digital XO and time alignment.
There are a few idiosyncrasies between the two wrt target designers and slightly different proprietary psychoacoustic filtering, but the end results are top notch for both. Audiolense can lower low frequency group delay and cancel the first major room reflection... While Audiolense has multiseat correction capabilities, I rarely use it as both Audiolense and Acourate use special psychoacoustic analysis algorithms that does not require multiple analysis measurements. Both low frequency correction and time alignment remain solid across a wide listening area based on a single analysis measurement. I show in my book how the low end correction and time alignment remain the same across a 6ft x 2ft listening area with 14 separate validation measurements.
Both can do partial correction to any frequency. If using full range correction, the number one mistake people make is over correction at high frequencies, which leads to harsh top end. If using constant directivity waveguides, in a digital XO scenario, as is the case for me, then some level of
constant directivity horn equalisation is required. However, I leave the top octave alone and let the compression driver and waveguide combo do its thing and always sounds better to my ears. If using full range correction, it is best to reduce the amount of correction in the high frequencies so the correction is more like a sloping or tilting "tone control" so one can adjust the amount of high frequency energy coming at you to taste.
Hope that helps.