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Make sure that you READ EVERYTHING before using it. RTFM :)
Acer - They have a few 34" 3440x1440 option available. They have the best FreeSync range (30-75hz and 35-75hz, supporting LFC in both cases). They lack good out of box calibration, and they also cannot do 2560x1440 for legacy content out of box (you can fix this with CRU).
LG - Their options have narrow FreeSync ranges (55-75hz) and lack 2560x1440 support. While you can fix this with CRU, my experience wasn't a good one. I had the 34UC98-W for two weeks. I couldn't extend the FreeSync range below 55hz without flickering issues. When using CRU to force 2560x1440, anything over 60hz had frame skipping. This means 2560x1440 with a FreeSync range of 55-60hz, which is laughable. But of the 3 options, LG has the best out of box calibration and overall image quality.
Samsung - C34F791, and I owned this for a week before returning it. Advertised as 48-100hz FreeSync range with LFC, that was a lie. It's 80-100hz out of box with an option to expand to 48-100 w/LFC. The manual cautions that this "may" lead to "some" flickering. Yea, it was crazy and I had to disable it. On the plus side, image quality was overall great, at 100hz it was the highest refresh rate option in this segment, and it supported 2560x1440 out of the box for legacy content.
All of these options have their flaws. I liked the UltraWide experience, but I'm going to sit this out and wait for another product generation or two before diving back in.
One last question, you said the Acer "cannot do 2560x1440 for legacy content out of box (you can fix this with CRU)." What did you mean by that?
Ok, let's take your standard 1920x1080 monitor. If you play an old game at 640x480, you can run this in a window, or full-screen. Most 1920x1080 monitors will support 640x480, but you will have black bars (letter boxing) on the sides.
Now, a 3440x1440 monitor should be able to do 2560x1440 full-screen but with letterboxing on the sides. The LG cannot (I've verified in person), and the Acer supposedly cannot (haven't used, trusting those who did) either. So if you get a game that doesn't support Ultrawide and you need to run 16:9 with letterboxing, you can't run 2560x1440 on the Acer/LG, only the Samsung. On the Acer/LG, you're limited to 1920x1080.