it's all about personal preference, i prefer bigger needle's= less time!
exspecially pinning over 2 1/2cc up to 3cc/per pin, dont wannna be sitting there for 10 min with a needle jammed into me!
damn couldnt imagine using a 29g either lol
as far as scar tissue goes, damn its not like we are injecting ourselves 10 times a day like heroin addicts lmao, yes u get scar tissue build up but come on alittle overrated dont ya say!