Depends on what Device you have. x32 can crack and the binary will be x32. While on x64, you need to install the app from iTunes to be able to crack ipa with both x32 and x64.
x32 or ARMv7 iDevices: iPhone 3GS, 4, 4s, 5, 5C, iPod 3G, 4G, 5G, iPad 2, 3, 4 & iPad Mini 1.
x64 or ARM64 iDevices: iPhone 5s, 6, 6 Plus, 6s, 6s Plus, 7, 7 Plus, 8, 8 Plus, X, SE, iPod Touch 6G, iPad Air, Air 2, Pro & iPad Mini 2, 3, 4 and later.
Terminal: (Can do this on mac as well)
x32
lipo nameofbinary -thin armv7 -o tempnameofbinary
x64
lipo nameofbinary -thin arm64 -o tempnameofbinary
Removing ASLR allows you to use GDB/LLDB to find offsets which you can search in IDA. (Replace the binary with ASLR to app's binary folder and put permission as 777)