Top or rear venting

I purchased a Hearthstone Heritage that should be here before the end of the year. There is an exterior SS chimney not being used i'm going to install a tee into and bring into where the stove will be installed. I was going to top vent the stove going up about two feet with close clearance pipe then 90 out, Ive decided I might want to just rear vent it and go directly into the chimney from the rear of the stove. other than making it a pain down the road to change to a different stove, ease of cleaning, or minimal heat loss from radiation from top vent pipe are there any major reasons why one type of venting is better than the other? going out the rear will make it look better and lower a mantel considerably. this will not be primary heat but may be used a fair amount. anyones experiences or opinions are greatly appreciated.