Personally I use laravel (4.2 + 5.5) and never had problems with backwards incompatibility.
Upgrade paths are clearly documented, and there are also free and payed upgrade tools available.
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LTS versions for laravel are supported for 2-3 years (bugs-security)
Symfony has 3-4 years of updates on their LTS versions
symfony.com/roadmap
Personally I use laravel (4.2 + 5.5) and never had problems with backwards incompatibility.
Upgrade paths are clearly documented, and there are also free and payed upgrade tools available.