I would say both are good rifles and it comes down to personal choice and what takes your fancy. I have very limited experience with a Sako but own an R93. As suggested there may be a lot of people upgrading to the R8 and so now might be the time to buy an R93. I haven't shot an R8 yet but it seems to me not to offer very much advantage, in fact perhaps some disadvantage, over the R93 unless you want some of the really big Africian calibers. MacLeods of Tain often have lots of 2nd hand stock so worth a browse around there but I would suggest that you shoot one before you even consider buying it as it might not suit you.
For me the big advantages the R93 offers are the practical ones especially went stalking away from home or in adverse conditions - breaks down for transport, breaks down to clean when wet, packs away into a small case, goes back to zero after being taken apart, very rust proof steel with the outside of the barrel treated, generally accurate and dependable, you only need one stock for two barrels etc. On the down side the cocking mechanism can be quite stiff until you get used to it but once you have the technique it just seems to work, the bolt is not to the taste of everyone, they are very expensive as are the scope mounts and many people who buy one end up with a house full.