Ralph decided that he could either hide and hope that the hunters went past his iding place without spotting him or he could break the advancing line of hunters, with getting spotted.
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Ralph and Jack never liked each other. Once they met and Jack wanted to take the power from Ralph there was instant friction between the two. It's was obviously Ralph's job to be chief and Jack just expected to get it instead of Ralph.
The two reasons of why jacks group is more exciting than Ralph is because jacks tribe hunt and have a feast and have fun.
During the meeting when Jack talks of hunting the beast Ralph describes Jack's hunters as, "boys armed with sticks." Later, during the confrontation at Castle Rock, Ralph calls Jack a Thief.
If you mean 'what are the strategies formulated by Ralph's oppostion to get Ralph out of the thicket' then there were two strategies. Jack first had a boulder from the top of castle rock sent crashing into the thicket with the intention of either killing Ralph or driving him out of hiding. When this failed Jack then lit a fire, hoping to smoke Ralph out of the thicket.
Ralph, Sam and Eric, and Piggy = To tend to the fire and get rescued. Jack and the Savages = To have fun