If weight is an issue for backpacking:
S&W 629 4" weight empty is 41.6 oz, Glock20 is 27.7 oz.
In fact, load 15 +1 rounds into G20 and the fully loaded weight is only 39.7 OZ, which is almost 2 oz LESS than an empty
S&W 629 4".
No comparison, the Glock is far lighter. Loaded, or empty.