Those two are not the same, correct? Is there much of an advantage of bridged 4 channel bi-wired vs regular 2 channel bi-wired?

I have an Aragon 8002 dual monoblock bi-wired and noticed a huge improvement in the sound over my old acurus 2 channel. Much clearer and cleaner. I'm aware some of it is simply upgrade in quality, but my understanding is the dual monoblocks are a large reason the sound became so clean.

I convinced my wife to put a stereo in the living room (!!!) and am trying to decide what to do amplifier-wise. I always buy used and 2ch options are greater/cheaper, but I'm wondering if it's worth holding out for 4ch. And, if so, monoblock vs bridged 4ch.

Sorry if this has been previously discussed. I couldn't find anything about it in a search.

Thanks for your help.