Must be Swedish Strv-122 MBT, This steel beast has helped me to conquer Finland, Norway, Russia and now kicking some *** in China
Also Swedish RBS-56 (Bill) missile teams rock, these have very long firing range and are very accurate, mostly seems kill enemy MBT's with one shot
From Infantry units i choose paras, small teams but very hard fighters as my enemy have found out after underestimating them.