May have some bad news for you. Unless you already have a Sako 75 SS in 300 wby in stock you might have a problem getting one directly from Sako. I recently was going to order the same rifle from my local shop and Stoeger in Canada indicated Sako was cutting back on hard to sell calibers??? The 300 wby was one of them. I did locate one through another dealer, luckily, so I didn't worry about it.
Based on the two rifles you mentioned and not including the T3, only the older Whitetail hunters. The Sako is a much nicer (rolls royce) finished rifle compared to the Tikka Whitetail Hunters (Cadillac) comparison. But they should both shoot well, with my nod going to the Sako.
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