Hey there! I totally get why you're feeling overwhelmed - the PLC world can be pretty intimidating with all those big names. Let me break down what I found for you:

First, the good news: PLC skills are definitely NOT becoming obsolete. In fact, the market is growing, with Siemens holding about 30-40% market share globally, followed by Rockwell Automation (Allen-Bradley) at around 25%. These two are the giants that will give you the most career stability.

For maximum future-proofing, I'd recommend starting with Siemens. Here's why:

1. Global dominance - Siemens is #1 worldwide, especially strong in Europe and Asia

2. Their TIA Portal platform integrates everything (PLC, HMI, drives) in one environment

3. They're heavily investing in future tech like virtual PLCs, AI integration, and cloud connectivity

Allen-Bradley is a solid second choice, especially if you're in North America where it's the market leader. Their Rockwell Automation ecosystem is huge and well-established.

The real key to staying relevant isn't just picking one platform though. Focus on learning fundamental automation concepts that transfer across platforms - ladder logic, structured text, networking (EtherNet/IP, PROFINET), and SCADA/HMI systems. Once you master one platform, picking up others becomes much easier.

Also, keep an eye on emerging trends: cloud connectivity, cybersecurity, digital twins, and AI/ML integration are becoming increasingly important. These skills will make you valuable regardless of which specific PLC brand you're working with.

So start with Siemens, build strong fundamentals, and stay curious about new technologies. You'll be in great shape for the next 5+ years!