270
The 270WSM will do everything the 270 now does 150yds further away.
For under 200yds, I would look at the bullet used especially if you lean towards the 130gr softpoints. Many have had issues with low penetration from a 270 let alone going 250fps faster. You will certainly run a big risk of bluing alot of meat.
I like the 150gr SST out of my 270 at 3000fps. Don't know if it will like going 200fps faster though?????
That is the only down side of these small cal magnums. At close range, they are going too fast for accurate softpoint bullets. Premiums are usually your best bet. Will they shoot well at longer distances though???? They most certainly are much more expensive especially if you need to practise, which we all could use more of. 50rds a year is not enough practise in my books.
I lean towards the 7mm WSM as my favorite as I am really having fun with my two 7RM's (basically the same performance). Allows very high BC bullets for LR plinking/hunting and heavies for up close work. Recoil is also very tolerable compared to a big 30 or 338.
For me hunting inside 400yds, there is little benefit over the reg 270 and I can use reg SST's in my 270. If going further, I like the better bullets of the 6.5, 7mm and 30.
Jerry