The signal strength is very impressive. Best I've ever had, and I'm getting 4G in places my buddy's GS3 doesn't. As for the storage - I suppose it depends on how you use your phone. If you listen to a lot of music, but don't want to stream it from Play Music, or some such service, you may want the option of external storage; not that the available storage on the phone isn't ample, but if you're looking to install a ton of really big apps (fancy 3D games being the most likely hogs) and a lot of lossless albums, I can conceive of things getting tight. Apart from that scenario, I can't think of any reason you'd need more than the One already has. Some might say that a lot if HD video and pics will suck it up, but I'm of the opinion that any such media that's worth keeping should be backed up anyway. And with USB OTG capability, it's easy to drop your files straight onto a flash drive.