Like many have already started I have been through many different antennas when I was more active on the HAM side. I spent a lot of money on comet antennas and others. some were good, some maybe not so good. I learned my lesson, some antennas are better than OEM but it depends on the radio and how you are using them. When I started my GMRS journey I forgot the lesson I had learned with all of my HAM HTs. I now have a collection of GMRS antennas. I have determined that it depends on the radio and how you are using them. Amazing, I know.
Actually the reason I was looking for different antennas with my GMRS radios was specifically to find a good flexible antenna that was at least as good on TX/RX as the OEM. I have 701s, 771s, Melowave Bandit Gs, a Smiley Slim Line, and even a Signal Stick cut for GMRS. All of them were tested on my KG-935G at specific distances in my mountain area. My big takeaway is nothing new; the longer antennas normally RX better when I'm on the ragged edge RX/TX. Anywhere else they all are about the same. With flexibility being my main desire I have a Smiley Slim line on my HT most of the time. If I am out in the mountains I carry a Melowave Bandit G in my pack in case I need the longer antenna. I haven't really had that need but it is easy to carry. I have found that the OEM antenna that came on my 925G is a very good antenna, but it is very stiff. The stiffer the antenna the more I am likely to catch it on something or poke my eye out again. Your experiences WILL vary.