Singlespeed & Fixed Gear - Non-setback Post or shorter stem

Those with experience:

what are the pros and cons of

(1) getting a shorter stem and keeping my setback post or
(2) keeping my stem and getting a non-setback like a Tompson post?

I need to reduce my saddle to bar reach: with my bullhorns (Nitto RB021) the 120mm is too long. It worked for the track bar but not with the bullhorns.

Moving the saddle forwards(or backwards) will change the KOPS. Changing the stem length won't change KOPS, but it will affect the handling. Your choice.

I would change the stem instead of the seatpost.

I would change the stem instead of the seatpost.
+1, don't **** with your knees. Plus, changing stems is easy.

IS KOPS that important? I've heard competing theories on that from fit specialists at various LBSs. For instance, looks at the Triathalon position.

I bought a setback post with the idea of stretching out my saddle to bar reach on a too-small frame that I just bought. I tried for 6-months to like it, but I finally came to the conclusion that KOPS is a completely independent adjustment that you need to figure out for yourself. For me, I need a zero setback for things to feel right. Opposite issue from you, but if your knees feel ok right now, I would suggest changing stems first.

+1 save your knees. Get a shorter stem.

You have to consider where you want your weight to go too. A shorter stem puts more weight on your ass; a non setback post puts more on your wrists. Id say though that 120mm is pretty darn long and looks to me like the more shaveable of the two lengths.

I'd generally vote for changing the stem, this is almost always necessary with bullhorns if your stem originally fit drops.

Most saddle rails are long enough that you could get a taste of how a zero setback post feel by just turning the seat post 180* and then putting the saddle on pushed all the way back. It's going to look a little goofy, but you could preview how a steeper effective geometry would feel for $0.00.

I'd generally vote for changing the stem, this is almost always necessary with bullhorns if your stem originally fit drops.

Most saddle rails are long enough that you could get a taste of how a zero setback post feel by just turning the seat post 180* and then putting the saddle on pushed all the way back. It's going to look a little goofy, but you could preview how a steeper effective geometry would feel for $0.00.

That's a great suggestion.

I appreciate the input from everyone.

Shorter stem FTW.