A planked top like the one used one Richard Maguire's (The English Woodworker) or Rex Krueger's English-style benches seem like an ideal option for a beginner. There are big disadvantages to man-made boards like plywood, chipboard or MDF for a workbench top, such as not being able to flatten it, and being unable to use holdfasts in it. Honestly, holdfasts are a bit of a gamechanger so that's a big one for me - if I had to chose between a vise or holdfasts on my bench, I'd chose holdfasts. Viseless woodworking is seeing a bit of an increase in popularity recently. Your workbench top will almost certainly not be completely flat when you're finished, so being unable to flatten it isn't great - it's not a dealbreaker itself, but combined with the holdfasts thing and the ease & similar cost of a planked top, I see no reason not to go for the planked top. Working on top of real wood instead of a engineered product just feels way nicer, too!
In my opinion, go make something like Rex Krueger's (on Youtube) English workbench build. It's a great first workbench, easy to make and rich with features - his free video series on it is easy to build along to and he has free (rough) plans available. The wide boards that make up the benchtop do cup a bit initially, in the first year or so, but one they're finished they stay stable forevermore - unless you let it get rained on regularly or move it to a desert or something. The English Woodworker has a similar bench build, which looks a bit more complex and costs £20 on sale. I haven't got it myself, but it looks good, so go check it out for yourself and decide if it's worth it - I've always found money spent on getting new knowlege is almost more satisfying than a new tool. I'm tempted even buy that series just for his great Bolton accent and mannerisms!
Also, this is all assuming you're doing mostly hand-tool woodworking - if you already have a planer, jointer, table saw, dust collector, router table, bandsaw, mitre saw and hollow chisel morticer then a simple plywood or engineered top will do you just fine. :wink: