Hi!
I typical use tactical and battle companies, in preference to veteran and devastator companies. One is cost and the second is VP's. You tie up a lot when you go with these. Any experienced player knows how to break either of these companies easily and rake in the VP's.
My particular favorite are battle companies. I get everything I want from one company card. Devastators to engage from afar, tactical to hold objectives and assault to engage any potential threats to the first two. Their flexibility is just too good to pass up.
Tactical companies are great for "disruption" tactics. Release one via drop pods and watch your opponent squirm. Their high break point via drop pods (and their high morale) makes then a cheap effective pain for the enemy.
Blastguns are nice, but without something to shred shields I find them of limited use, or they are just good for tank busting which, isn't a great use of titan points. I rather go with twin turbo cannons for that.
I've always had good experience with the big plasma weapons. Its virtually an insta-kill against unshielded targets. That many dice hitting with 3 to 4+ and -3 to -6 armor save is just too good to lend without restrictions. Defense lasers (volcano cannon) are great, but its one shot, that still needs support of weapons that shred shields for it to be effective, but one shot is much more likely to miss that 4-6 dice. Give me the plasma bad boy every time....

All that said I have been a secret proponent in generalizing the emperor class titan reactor output management to ALL titans. Then weapon firing becomes a resource management. So much energy to go around too many options for all to be had.
Of course that was perhaps one step to far for many back in the day, but I wounder now. The system would be simple, just a slightly tweaked form the Emperor Class uses now.
Plasma output
Emperor 1d6+6
Warlord 1d6+3
Reaver 1d6
Warhound 1d3 (half a d6)
Starting plasma is 2 for a warhound, 3 for a reaver and 4 for a warlord.
Same parameter of usage applies like the Emperor Titan
Shields - no plasma, no repair, 1 plasma repair on 5+, 2 plasma repair on 4+
Engines - no plasma no move, 1 plasma advance orders, 2 plasma charge orders.
so far same as Emperor, the fire control is the only thing I'd change to keep things simple due to the many weapons available.
Three weapon types:
Tier one Ballistic weapons. Any non laser, non plasma weapon. All special hard points fall under here (like corvus assault pods, etc).
1 plasma lets you fire any and all these weapons on advance or first fire orders. Most economical weapons due to low power requirements
Tier two laser weapons.
1 plasma for any and all laser weapons on advance orders, 2 for firing them on first fire orders.
Tier three, plasma weapons
its 1 plasma for advance and 2 for first fire PER WEAPON SYSTEM. Want to fire 2 blastguns on first fire orders? it will cost your FOUR plasma.
All cost remain the same.
I believe it is an easy system to "plug into" the current one without fiddly rules and its based on known rules mechanics present on the Emperor class titans.
Thoughts?
Primarch