Straight blade forks use either an offset at the crown or an angled insertion to achieve whatever trail amount the designer wants. Other than that, the only differences between curved forks and straight blade forks is cosmetic and one less manufacturing step in building a straight blade fork (which is the real reason they have become popular). Some people contend that a curved blade is better able to absorb road shock than a straight blade, but it has proven difficult to quantify this in any meaningful way.

So, go with whichever suits your fancy.