Preparing spells might actually be worse for a Ranger.
The Ranger Class spell list has a number of spells that have effects that don't require a Saving Throw.

A Ranger PC doesn't have to to have an *impressive* Wisdom score, to use their half caster Magic. A single class Ranger, (depending on the subclass), could even elect to dump-stat Wisdom, since the RAW Ranger Learns their spells.

In the lower Tiers of play, a Paladin's CHA modifier is more impactful in terms of the amount of spells the PC can Prepare, when compared to half of one's Class level.