LG has some amazing features and great screens probably has hands up better specs over one plus. but if I won either of them I wouldnt mind , better than my outdated Samsung Galaxy S 3
8GB Ram and 128GB storage is for sure the better and wiser option for various reasons :
faster , smoother performance and operation
better value for money
more space for apps,photos and updates
water or liquid damage is the worst thing for a phone or generally electronics. sometimes its cheaper to replace than to fix. maybe try a little steam to clear away the sticky residue then maybe a hair drier to abosorb the left over humidity.if it doesnt work buy new ones