When comparing Let's Split vs Anne Pro, the Slant community recommends Anne Pro for most people. In the question“What are the best mechanical keyboards?” Anne Pro is ranked 18th while Let's Split is ranked 23rd. The most important reason people chose Anne Pro is:
You can connect the Anne Pro to a computer without the hassle of wires, as it has built in Bluetooth connectivity.
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Pros

Pro DIY
You can really make this board your own. The seperated space bar makes it even more fun than the regular Planck because you can program both space bars differently. You can also get the keys much more easily because you just need a pair of single key width keys.

Pro Split layout
You can set this board up in a very ergonomic manner
Pro Bluetooth connectivity
You can connect the Anne Pro to a computer without the hassle of wires, as it has built in Bluetooth connectivity.
Pro Smartphone app-controlled RGB customization
You can customize RGB colors and lighting modes using a smartphone app. This is a step-up from most non-big-name keyboard manufacturers that tend to go with on-keyboard customization control which can get quite confusing.
Pro RGB lighting
You get per-key RGB lighting with the Anne Pro, along with a number of different lighting modes.
Pro Priced really well
You get a lot of features for the money. Along with the 60% form factor ( most keyboards in this size are quite expensive ), you get full RGB lighting, ,PBT keycaps and Bluetooth connectivity, but at a lower price compared to other options.
Cons

Con DIY
Most people just want to buy a keyboard so that they can have it and type on it. But if you're ordering an ortholinear 40% split keyboard, you've probably already got strong enough opinions on switches, key layouts, and keycaps, that you're not going to be very satisfied with a mass market keyboard anyway.

Con Somehow cheaper to spec out than a Planck
This keyboard is based on the Planck. You would think that the Planck, what with its popularity, would cost more. Somehow, it's actually cheaper. This actually has to do with the case/frame. Instead of ordering a really nice prefabricated case, you end up ordering laser cut panels and spacers to create a frame to hold the whole thing high enough off your desk to type comfortably.
