That will depend on your intended use? what you're planning to carry. If you edc a laptop you will need a connor. The connor also is a better platform for organization if you're into that. The tara is a great small daypack, you can increase it's organizing abillity with the tara insert. Both are very well made and backed up by HPG.
I have both, my tara is used every day for about two years now. I have two tara inserts one set up for outdoor stuff and the other for work. I keep the insert in the slot pocket, lunch and a rain jacket or fleece in the main body. Then a hydroflask in the external pocket. My connor is outdoors only.