I was going to go with an ext. rather then an in sump because of heat, ease of access, adding more space in my sump,and most ext are more powerfull and made better I think but just couldn't fit one in my stand w/ my sump w/o running pvc off the sump to the pump and then up.Ideally I wanted the pump attached to the sump and then up with pvc.
It's up to you how you go either way works lol