Dear Team - see subject. I tend to use "64 bit" --> "just because it feels more modern" but I just had a closer look with QAP since it's offering both: 

It does not matter with (my) functionality, both versions seem to behave exactly the same. The only difference I noticed was approx. 30% more RAM memory consumption for the 64 bit version.

Since I also tend to optimize every bit of CPU and memory consumption - why should we use the 64 bit version? Any concrete advantage for this? Maybe CPU load is lower on a 64 bit system? Anybody tested this or any experience?

Sorry for another very stupid question - I searched the forum and website but no real answer found, almost no hits...

I know that AHK offers both compiling 32 and 64 bit, but I never understood what's actually recommended for a standard 64 bit Windows PC these days... Thanks for having this discussion :-)

The two builds are made from the same source code and have 100% identical feature set.

I'm not expert in this and feel free to complete. The difference is in execution speed and memory management. This can make a difference with my other app CSV Buddy that can read very large CSV files but with QAP it makes no real difference. The 64-bit should be a little bit faster but I never tested it.

So, in the end, it is your call. I distribute both for all my apps and let users choose.