New tire HELP PLEASE!

Hello! I guess let me start by making it known that I am a total newbie to the Utility ATV world! I am coming from a Yamaha Raptor 700R and recently purchased a 16 Grizzly SE. I am looking to change the stock tires and I know the front tires and rear tires are different sizes. I am looking at a set of Interco Swamplites in either 28" or the 29.5". I would like some opinions on which size would probably be the best… IF the 29.5" would even fit??… Also, how do you choose the difference in the front tires and rear when going up in size? You wouldn’t want to order 4 tires that are the same size would you??… All answers are greatly appreciated!! I mainly ride hard pack trails and the occasional mud hole and creek crossing. Thank you again for any input!!