They basically transmit and receive the same , both are decent radios . The 78 is bigger with more features , sometimes a SWR meter is a nice extra compared to the 25s not having one , your 25 is tuned ,is the 78 tuned ? you might add that if it's not and if you would like to have it tuned would cost you a few more dollars to have it done. IM a 25 kind of guy myself (I like them from the early 80s), but mine is also tuned for my amp and I like the noise blankers in the 25's more so then I like them in the 78s (at least for my car anyway) but the 78 still has good noise blankers all the same. yes the 78 cost about 40 to 50 dollars more then the 25s but your basically paying for the extra features and that's all good. So one really isn't better then the other as far as performance goes , one just has more features. If you are happy with what you have and it works to your liking ? maybe you might just want to keep what you have already , if you have noise in your ride and the 25 takes care of it , the 78s noise blankers will be slightly different to your ear , for me and my car at this time , there's no way I would run a 78/29/76/ been there done that and nothing topped the 25s for me !! Good luck to you