The brown gremlis are "Friendly Gremlin"s. That's just their unit name. They only summon, buff and ress their own mates but cannot cast nor damage your troops while the red ones "Evil Gremlin"s can only cast offensive spells like pygmy, sheep and lightning strike.
As for the troops, as stated, it depends strongly on who you're facing, what you have available in decent numbers and what strategy you pursue. There is also no "good" setup ^^ At least not in general. For example an army that heavily relies on ancient vampires tanking and refilling themselves through life drain and for example 2 ranged units using bows (like bowmen and hunters for isntance) will face serious trouble facing an undead army. Vampires won't be able to drain life and undeads only take 50% arrow damage.
I hope this example explains why there is no general "good" army whatsoever. Play around, try, adapt and search the forums for setup tips. This subject has been chewed bland.
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