Hi all,
I'm new to the group and really thankful for the wealth of knowledge here.

I know there have been posts on both of these bikes previously, which helped me narrow it down to these two. I'm doing my first complete bike build (and first Chinese frame). I got into racing last year (crits and hilly races) and want to replace the heavy and soft Giant Defy Advanced 2022 I had with a true race bike that I can afford. I'd be selling the Giant and using this as my one and only bike aside from a commuter clunker.

Those with experience with either or both of these two bikes or the factories in general, do you have pros/cons or feedback in comparison for:

-Ride feel/overall frame quality - stiffness, comfort, handling, etc.
-Quality of product and manufacturing: any issues to be aware of when you received a frame/parts?
-Other comparisons based on experiences with the frames or companies

I got a good black Friday deal on a Shimano 105 Di2 complete groupset with BB, and have Hunt aero wide 50mm wheels and a 4iiii power meter crank arm already that will go on.

I've been in contact with both Justin from Speeder, and Yanyi from Yishun. the quotes I got for Frame/fork/seat post, thru axles, headset pieces, spacers, bars, shipping, and Paypal fees (just Speeder) are:

Speeder SC-R52D Size 48.5: $1,005 USD
Yishun R1058D Size 52: $929 USD* wasn't given a Paypal fee, but assume there might be one added

The Yishun is in stock I am told; the speeder would be 2 month lead time.

And I'm open to suggestions for other quality and similar frames if there are better than these two. The Lightcarbon frames look a bit heavier and reach a little shorter for me, but interesting options.

Thanks so much!