Chili, if you are going one gauge up or down (10's to 9's for instance,) you won't notice a BIG change, but chances are you will notice a subtle change- the kind you have to listen for, at first, but then it stays with you- that's been my experience, YMMV. You got me curious as to what Tele's ship with (I am assuming you play a FENDER Tele...) of the three I viewed on Fender's site, two had 10's, one 9's.
I follow conventional wisdom in few things, but one is I play 9's on my Strats (Fender and other brands) and 10's on my Les Pauls (Epi and others.) Have not decided what to run on
the Washburn X-30 I just got- it's something of a "Super Strat," with 24 frets, but it's got humbuckers and a tune-o-matic bridge. Still playing the ones that came on it, and I can't tell what gauge they are, as my micrometer fingers are not working very well these days.
It bears mentioning that jazz men, being the crazy types they are (the kind of thing you'd never know by their playing, until you realize they are playing some chords that just the
names will make your head spin,) usually like 13's. Heck, they might just as well replace the strings with steel
rods...