GB for iOS can record at 24-bit, but not at 48kHz, AFAIK. The internal audio engine is set to 44.1kHz, I believe.
Logic Pro 4 iPad supports 24bit/48kHz.
That said....this isn't a cut/dried thing.
Internal audio hardware - iPad Pros (and I think later model non-Pro iPads) support 48kHz by default. Earlier/lower-end iPads default to 44.1.
When using external audio hardware - iPads "can" support higher rates/bit depth - but this is dependent on the audio hardware being used and if it can be physically switched or switched thru a software utility.
For simplicity - LP4iPad offers cross-platform compatibiity with Logic on the Mac (projects, not just wav files...so FX, synths, presets, patches, routings, region/arrangement/tempo, etc.) - and you can subscribe monthly/yearly....as needed. Monthly might be best if the x-platform thing is only needed a couple of times a year.
Personally, had no problem with paying the yearly subscription and have found that LP4iPad has been used way more than I expected I'd use it. It'll never be my primary DAW, but it's come in handy on a few occasions (including a couple of impromptu recordings/jams - and I just happened to have the iPad in the car at the time...so got lucky).
Not sure about other iOS DAWs.