I found that many people are crazy about these two. Can only say that each has its own advantages. Personally, if the high-gain timbre has metal distortion, the HD500 will have more pure distorted sound, but if you want to run various games such as weddings and celebrations, the small stage bar performance GT 100 has better adjustability and convenience. In terms of timbre, BOSS's box simulation is not bad except that the high gain distortion mentioned above is slightly lower than that of HD500. Probably because GT 100 has fewer box simulation options, only1× 82×124×12 has not been refined to 65438. . . However, there is nothing wrong with low gain distortion such as creaking or tw clean sound. Personally, I prefer BOSS's pedal button and Line6 nail switch. Every time I click, I always feel that stepping on thousands of feet will not break. . . In short, if the pursuit of pure timbre suggests line6, and if the pursuit of convenience and adjustability does not require high timbre, GT 100 is more suitable.