U line stool is not very well made. and they letting you know ahead of time by offering a 1 year warranty.
Office Master comes with 7 years warranty.

Based on the features below this Uline stool compares to the WS23 chairs from Office Master.
U line claims 300LB weight capacity. Office Master list their Stools at 250LB weight capacuty.
The chair actually holds more weight.  I have seen some big guy seating on those before.
Most manufacturers always reserve from disclosing the actual weigh capacity
Just in case a heavier guy might wan to push the envelope, most chairs are rated at 300-350lb weight capacity.

Office Master Stools

They only offer (2) versions of the same stool
The price below is for the standard chairs (as shown) 
Your choice Glides or standard caster wheels minimum quantities of 12 apply
Free Shipping and Assembly! 
We will deliver the chairs fully assembled. 
Other options available but add on charges will apply 
18" Chrome ring add $10 
65MM Grey two-tone multi-surface soft caster add $18
50mm Safety soft casters, minimizes chair movement when NOT in use $18
50mm Reverse braking caster, restricts chair movement when chair IS in use $25

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Lowest prices. on line I found from reputable and authorized dealers
​are WS23 $257 and the WS25 $291  plus shipping and you will have to assemble the chairs.

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WS23 / YOUR COST $225

Overall Width 25"
Overall Height 35-45"
Back 15.5"w x 12.5"h
Seat 17"w x 16"d
Seat Height 21-31"  
​Warranty 7 year limited

Features:
Pneumatic lift         
Pivot backrest         
Back height adjustment         
Back depth adjustment         
20" black footring
Molded polyurethane backrest
Weight Capacity: 250 lbs

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WS25 / YOUR COST $245

Overall Width 26"
Overall Height 36-49"
Back 15.5"w x 12.5"h
Seat 17"w x 16"d
Seat Height 22-32"
​Warranty 7 year limited

​Features:
Pneumatic lift         
Pivot backrest         
Back height adjustment         
Tilting backrest         
20" black footring         
Tilting seat
Molded polyurethane backrest
Weight Capacity: 250 lbs

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Here are old (iPhone) pictures of the actual chair (WS23)