Final decision lies in your hands when you visit both apartments and judge for yourself. Both are rather old (close to 20 years old or more) so you may need to do a bit of renovation to keep the unit refreshed if it's still on the old fittings.

A friend used to be choosing between Green Avenue and Anjung Hijau (Greenfield) and chose the latter as he prefers less facilities (no gym and other kind of facilities) and therefore the monthly maintenance fees is very low. If I am not mistaken it is less than RM100. This may be a deciding factor for you as some people might prefer more facilities, though maintenance fees will be higher.

Yes, Green Avenue may be closer to 10 years than 20 years, though in my mind it's still an old condo. It's newer than Anjung Hijau which should be close to 20 years if not more.