This is a combination with a fair amount of natural synergy. Both classes are exclusively martial at their base with no spellcasting component in the class itself (though obviously archetypes can provide some magical capabilities). In addition, the ranger’s stealth and boosts to damage and the berserker’s expanded critical range with big, damaging weapons can make for an extremely potent combination. To the extent that there’s any conflict between the classes at all, it’s more a question of the ranger’s more tactical approach via stealth and ranged attacks vs the berserker’s all-in, frontal assault approach. The character will likely want to focus heavily on physical ability scores and perhaps a bit of Wisdom, depending on which ranger features are used. The flavor of the character is unlikely to change much regardless of the mix of levels; you will have a potent martial powerhouse with high AC, high damage, and lots of hit points who can strike up close or at range and survive in the wilderness more or less indefinitely. The specifics essentially amount to personal taste and details. [[Synergy Feats for Multiclassers#Berserker w/ Ranger|Berserker - Ranger chains and ideas]]