Tortoise guide part 2?

[CoachPappy]

Looking for advice for a 2nd phase of building. I have 2 accounts (908 730 401,and 516 296 367), both earn about 100k an hour. The first is level 8 and 256-1 in fights and has 1400 defense. The 2nd is level 12 and hasn't lost a fight in a while and has a 1600 defense. Both are loaded up with engineers and transports. All unit building have been built but not upgraded as I have concentrated on money buildings. My question is do I continue with the purchase of transports or should I move to other units? Should the units be low mortality but have both offense and defense or just one trait or the other?

[Tanner]

I believe JMC can weigh in here, but if I remember correctly, he recently began moving toward having both units that are especially defensive and units that are especially offensive.