I liked Garmin pilot, ended up with WingX and like it a lot (I went against everything I believe in and got an ipad to give foreflight a chance). No experience with droid EFB. There are some good free ones like Avare too worth checking out. Despite being a guy that prefers android, I'm not an expert here. Having GPS feature should have nothing to do with a WiFi connection. If the device is GPS capable, it will work no matter if you have a wifi/data connection or not. If the maps are downloaded, it will work, even in airplane mode. With an ipad, you have to have one that is cellular capable to have the GPS function, i think Android devices vary by manufacturer.