Sorry, I missed this one....
The NX Otica's and NX-Treme's are more similar than dis-similar. The biggest difference is that the NX_tremes just have that extra room filling ability for very large rooms which can produce , or seem to produce , a more spacious / bigger sound.
Given all things equal, networks, wiring etc, the detail levels and overall tonality of the speakers will be the same. They both have great detaill levels with the OB GR Neo3 and a fairly rich midrange thanks to the 2 M165NQ's. Even though the speccs likely show the bass roll as being very similar, I'd have to give the edge to the NX-Treme's. In my 18x12 room, the NX - Otica's did well down to about 40 hz, with a little boost around 34 hz, you could get them basically flat to 30. But, when took them up to Don's, they fell off much earlier while the NX-Treme's did not. His room was probably 16 x 35 or so and the NX-Treme's were basically flat down to the 40Hz range... results will vary depending on room size/shape etc.
In a smaller room, you may be happy with either sans subs, just depends how much that lower octave is to you. If you are going to run them with subs, the OB H-frames are the way to go IMHO.
As for weights, the NX-Otica's come in at approx 80lbs each built. The NX-Tremes I'm going to say somewhere in the 130 lb each mark built.
Our duals come in at 75lbs (flat pack, which comes out to approx 110 lbs built out.
Triples would be 95lb for each flat pack, approx 160 ish built out.
The main box for the Otica flat packs is 84 lbs, the main box for the NX-Treme flat pack is 130 lbs.
Hope that helps a bit
jay