TC uses 1:10 for all of their 17 caliber barrels, rimfire or centerfire.
IMO it comes down to your primary requirements for the barrel. Is shot placement important enough to you to want to hit exactly where you want to, or is close good enough? Rechambered factory barrels generally shoot quite well if the barrel was "true" to start with. Custom barrels mainly gain their edge by being made out of premium quality blanks with the extra benefits that allows to be built into them, so they usually shoot better than factory barrels.
As a long to very long range P&V hunter I've always bought custom barrels to get the most precise shot placement I can get at those extended ranges.
YMMV