Dinobot was easily my favourite, he was very honourable and never saw eye to eye with Rattrap. His death still makes me cry, even to this very day. My second favourite goes to Depth Charge - he was the loner type, acted like Clint Eastwood with his nihilistic, anti-social machismo attitude, but at least he went out fighting.
Best line from the series goes to...
BlackArachnia: Why do you always talk to yourself?
Megatron: Er... i.... simply have a penchant for intelligent conversation!
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"I've seen things you people wouldn't believe: Attack ships on fire off the shoulder of Orion; I've watched c-beams glitter in the dark near the Tannhauser Gate. All those moments will be lost in time; like tears in rain. Time to die." Roy Batty