I need all the ugga duggas. Milwaukee? Harbor Freight?

So my somewhat puny air impact has met its match in the slightly corroded bolts that hold the mower blades to the deck. So I need something bigger, stronger, faster and all that.

The big 18V Milwaukee seems to have a good reputation on the 'tube, and Harbor Freight has a similar sized 20V "Hercules" brand impact.

For occasional use, is the Harbor Freight going to do the job or should I just spring for the Milwaukee? I have no horse in this race as my cordless tools so far are Rigid and I don't think they have an impact powerful enough for my need.

I have the Milwaukee and am very happy with it. But Ridgid has come out with a high torque impact:

https://www.homedepot.com/p/RIDGID-18V-Brushless-Cordless-4-Mode-1-2-in-High-Torque-Impact-Wrench-Tool-Only-R86212B/318370189?source=shoppingads&locale=en-US&mtc=SEM-BF-CDP-GGL-D25H-025_001_HAND_TOOLS-NA-NA-NA-DSA-NA-NA-NA-NA-NBR-NA-NA-NA-Hand_ToolsDSA&cm_mmc=SEM-BF-CDP-GGL-D25H-025_001_HAND_TOOLS-NA-NA-NA-DSA-NA-NA-NA-NA-NBR-NA-NA-NA-Hand_ToolsDSA-71700000117978843-58700008688451235-39700079758189535&gad_source=1&gbraid=0AAAAADq61Uc23mJyHOIEfCC3aNdp9So8H&gclid=EAIaIQobChMI9N-3ysnWhQMVfTbUAR3qAgRQEAAYASAAEgKwNfD_BwE&gclsrc=aw.ds

and if I was already in the Ridgid battery ecosystem I'd give it a shot. 
 

ooh better deal with two batteries for $199:

https://www.homedepot.com/p/RIDGID-18V-Brushless-Cordless-4-Mode-1-2-in-High-Torque-Impact-Wrench-Kit-with-2-4-0-Ah-Lithium-Ion-Batteries-and-Charger-R86212KSB/325264378

it says it's 52% off

I got a Milwaukee on sale a few years back. I'm very happy with it. It's ugga and dugga has been plenty for my uses. 

In reply to dculberson :

Oooh, cool. That Rigid combo pack with the additional batteries looks like just the ticket.

Holy Carp! That $199 deal is a steal. 

RIGID ordered, should be here on Thursday.

Thanks for the recommendations and pointers!

Should be here today, but tracking shows it hasn't even reached the shipper yet.

Oh well, it's not like I bought it because I needed it.