Hey there! I totally get your dilemma - it's like choosing between two great tools that work differently. As a beginner, this choice can feel overwhelming, but let me break it down for you in simple terms.

First, let's talk about the programming ecosystems. Mitsubishi's GX Works software is often considered more intuitive for beginners - the ladder logic programming feels more straightforward and there are plenty of online tutorials. However, Siemens' TIA Portal has a steeper learning curve but offers more advanced features and better integration with other Siemens products.

Here's my practical advice: If you're just starting out and want to grasp PLC fundamentals quickly, Mitsubishi might be the easier path. Their programming is more visual and the learning curve is gentler. But if you're thinking long-term career growth, Siemens has a massive global presence (about 85% market adoption vs Mitsubishi's 65%), meaning more job opportunities and resources available.

For your first project, consider these factors: What's your local support like? Are there more Siemens or Mitsubishi technicians in your area? What about software costs and availability? And most importantly - which one excites you more to learn? Sometimes the platform you're more motivated to master is the right choice.

Both are excellent PLCs, so you can't really go wrong. The FX5U is fantastic for high-speed applications, while the S7-1200 excels in communication and process control. Whichever you choose, dive into online communities and tutorials - there's great support for both platforms!