We are huge wooden train track fans. Definitely buy the wooden ones as they are great for open ended, imaginative play. I like the cheaper track from target but add in some Thomas stations, bridges and tunnels. We also have lots of Thomas engines. My kids found the ikea ones a bit hard to use, as the connections are plastic attachments rather than part of the wood, but that was a while ago. The Jack and Jill set from Aldi is also super cheap.