Hi, 

Have not tried either of the brands you mentioned but am happy as could be with the Progressive gas cartridges that have been in my bike for many years, can't fault them in anyway. Much better than just adding Progressive heavy duty springs which is what I have done with another bike.

I agree, and thinking of them for my 23 SG ST. I have had progressive cartridges in my 16 Heritage forks since 2018, and they have done me well. For my SG ill look at Progressive front and rear. 

Have a look at the Screaming Eagle/Ohlins shocks which are designed for HD's, I did them front and rear on my LRS and it made a big improvement to the handling, the shocks are really easy adjustable, along with the Avon Cobra tyres the bike feels awesome, I got them with a 20% off sale last year, I've also heard Bitubo shocks are good and well priced also- https://www.bitubo.com.au/shop/?wpce_search=58325&post_type=product & https://www.youtube.com/watch?v=UY-1EXNxtb0