When comparing 0% purchase credit cards, it's essential to look at the length of the promotional period, as this can vary significantly between cards. Additionally, check the interest rate that applies after the 0% term ends, as well as any fees for transferring a balance or making purchases. Consider the credit limit offered and ensure you can comfortably pay off your balance within the interest-free period. It can also be helpful to read the terms and conditions closely, and if you're unsure, consult with a financial adviser for personalised guidance.