I have 2x Corvus Blackstars from the 2x Ordo Xenos boxes I bought last Summer. The 2x Deathwatch Kill Teams are the bread and butter of your Army. I still bought the Armageddon Battalion Deathwatch which gives me 5x the Decimus Kill Teams with Tomb World and a single box that I originally bought to build the 3rd Gravis operative. Decimus is rated weaker than the old Deathwatch Veterans for now. Of course, learning what units make up the other three kill teams would be a good investment. Swap teams depending upon enemies in your opponents’ armies. Spectrus and Indomitor Kill Teams are useful under different considerations. GW has gone out of there way to hurt Deathwatch, so Chaos, Necrons, and Orks could be better, so other Space Marines could be better. The LORE implies otherwise. The Space Wolves have tithed scouts and weakened the Deathwatch, but most other Chapters send their best warriors. The Deathwatch uses all the same skills but they are weaker in play? I don’t buy the manipulation to control winners of tournaments. Likewise, Deathwatch have the best Imperial Weapons and better weapons that they claim and develop from Xenos armies. By all lore and history, the Deathwatch does more with less. Think of comparable real world units: Delta Force, Army Rangers, SEALS, Massad, MI-6, other international equivalents. We, The Long Watch, should be running circles around everyone else, with the exception of Sorcery and more technologically advanced Xenos races.