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Pocketbook app on Android is good for TTS. That can give longer run time on some phones and tablets than eink if the screen turns off as ereaders have small batteries and rely on sleeping while you read a page to get long run time.
The PW3 (needs USB adapter) and later Kindles have accessibility voice (voice view), rather than TTS, so navigation is voice prompted. The DXG and K3 have real TTS with the normal UI. Voiceview isn't for regular TTS, but for blind and partially sighted people. Some Kindle ebooks don't support it (or TTS on older Kindles) for DRM reasons.
PDFs may not work on anything if they are scans. OCR text for search isn't great for TTS. I've not tested any text based PDFs on anything.
Alexa has severe privacy issues and may need an Internet connection.
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