I want to share some unit quirks (you might already know them), and then you can decide what's best for yourself. 1) Fedakins finre a weaker version of sonic beam, but they can cloak, are cheaper, rides worms, etc. More cost-effective than the sonics. 2) Projecters can give you an extra sub house. First choose anything but Tileaxu, then use project enemy leeches and contaminaters, then attack you own disposiable unit before the projection goes away, and you now have Tileaxu units. 3) Sonic-based weapons do more damage to large units: the waves pass thru the unit, the longer it stays in the unit, the more damage. 4) Deviated missile tks are not as painful, because they attack only one unit at a time. Sonics are usually at the frone lines, and they will fire at the units at the back to do lots of damage you.