I keep all my photos in both Apple and Google Photos and yes, Google’s search is far better than Apple’s. Both are able to locate photos based on their exif data, file name, and a person’s face (you do have to train each system individually). But Google will pull up photos of, for example, the Crew Dragon capsule when you search for “Space” etc, Apple will not. Recently when I searched for photos taken at a ranch in Mexico using the term “cattle” Apple Photos suggested I search for “mammal” or “cow”, Google just displayed the correct photos.
Apple lost points with me when it changed the app and started renaming my original photos with long strings like “1A97R39B-0E65-4309-A646-342C8249CEB9.jpeg”. I’ve had to recover photos several times for friends and users over the years. And in most cases the database was trashed but I could recover all of the original files. With today’s Apple Photos this means I would have to manually rename each one of thousands of images individually should this happen to me.
My iPad Pro is my primary device. I currently have a Mac, but will not be replacing it when dies/becomes obsolete. So I use the Google Photos IOS app to sync Apple Photos to Google. Until Apple creates a true backup app for IOS, or allows 3rd party solutions, this is the only way I have to backup my pictures without a Mac/PC. (If an image is deleted from Apple photos it is not deleted from Google).
Some of the features of Apple’s transfer service might be useful to you such as “Whenever possible, photos are transferred with their albums.” Others may not “Once transferred to Google, the filenames of albums and videos start with ‘Copy of.’”
Apple Photos and Google Photos are both good. But I find myself using Google Photos more often. For example on IOS when you are looking at your pictures in GP you can swipe up and see the file name, date, time, and location where taken, and see the location on Google Maps.