Both are user serviceable, with the Spectre being 0.9" longer and 0.3 oz heavier. The sound reduction is rated similarly between the two. The Spectre is has a lower MSRP, and having disassembled both I'd go with the Spectre as I would think the disassembly would be easier when the lead buildup becomes heavy.
I'd go with the Spectre as I would think the disassembly would be easier when the lead buildup becomes heavy.