EDIT**

In terms of infinity VS. alphabet disc...I think alphabet pendants are absolute classics, and are timeless! I always thought the infinity might be a nice gift from a significant other, but beyond that, I wouldn't buy it for myself. I also don't love the double chain look.
Bottom line- choose the one you LOVE best! The one that makes your heart sing
every time you look at it, and suits your style best. Either one you choose will be an absolutely fabulous everyday necklace.
Reference pic of my letter pendants side-by-side:
Yay, good for you! And definitely NOT 'too young for you'...the alphabet disc is TIMELESS and therefore, ageless-- just like we all hope to beThank you so much everyone! I've decided on the Alphabet pendant. The small (0.5" on 18" chain). I'm so excited! I've been wanting a new everyday necklace and this seems perfect for that, plus it seems like it will have longevity. I'm almost 30 though - this isn't too young for me, right? I know, I know, I'm late to the game!!

Agreed!+1
I don't see the infinity necklace as a longtime piece, personally. And I prefer the script letter. So classic.
I love my Elsa Peretti alphabet pendant, but I equally love my disc pendant- they are different looks. The only thing with these two pendants is that you have to know beforehand they're only a 0.5 inches in diameter. If you're okay with that, great, but if you expect a bigger disc, then you'll be disappointed by the size.Not to confuse you more, but have you check out the Elsa Perreti letter pendants? I have mine in gold and I just love how modern yet classy it is.
In terms of infinity VS. alphabet disc...I think alphabet pendants are absolute classics, and are timeless! I always thought the infinity might be a nice gift from a significant other, but beyond that, I wouldn't buy it for myself. I also don't love the double chain look.
Bottom line- choose the one you LOVE best! The one that makes your heart sing

Reference pic of my letter pendants side-by-side: