 If you liked
Kidou Senshi Gundam: Dai 08 MS Shoutai
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 ...then you might like
Buddy Complex
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Both are Sunrise Mecha series that deal with a romance that crosses faction lines, although said romance doesn't take center stage until about halfway through the series in both cases, and they also feature a lot of character drama and well animated combat.
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Recommended by FinalReality56