iDempiere is a whole different level than OpenErp (Odoo). We use both, but a total different playing field. iDempiere is a super robust ERP (I believe its a fork o Compiere o Adempiere (not sure)). They have another “cousing”, which is called OpenBravo which we use since about 7 years ago, very similar specs, but hands down we would go with iDempiere. There’s a guy online that has done wonders to push the iDempiere project. His name is Chuck Boecking. https://www.chuckboecking.com/
Our infrastructure is:
CRM: SugarCRM
ERP: OpenBravo (although we still use it because we have it earlier but prefer iDempeire)
ERP1: iDempiere. We use is as inventory management, quoations etc etc)