DDM4 PDW for $1,400 on a built lower I already have with a law folder vs Sig Rattler LT 300bo for $2,400 (if I can find one)?

Is the sig really worth the extra money? Whichever will be suppressed normally running supers 75% of the time. This will be a backpack travel vacation gun. I'm not broke but badly bent so I can afford the sig but when they quit making parts for my sig 556 and what you could find was expensive worries me a little about the sig. If the military wants something different will sig discontinue the mcx platform? I've got a bushmaster from mid 2000's that I can get parts and Gucci out if I wanted to still today. I don't know anyone who has either so I don't know anyone to ask.