Could A50 or M10 be a single unit replacement to Oregon 300 and Nuvi255?

[druidness]

I need Garmin for it's map standard wide support, means availability of 3rd party local maps and topo maps.
I own now Garmin Oregon 300 for hiking and Nuvi 255 for car navigation but I'm not satisfied with Oregon small screen size and Nuvi doesn't offer any hiking support with it's limited on batteries time.
Could Garmin A50 or M10 with bigger screen replace the both I own + providing Internet access? A50-M10 seem to be a pair in screen size while A10 sems older and has slightly smaller screen)
Any other ideas which device could be a replacement for both while remaining in limits of reasonable price ?
Is there any 3rd party devices providing a little bigger topo display and car voice navigation, while maintaining full support for Garmin map standard?

[catymag]

Garmin maps work on Garmin devices only
may be nuvi 500 it's ok for you, but it's a bit outdated, no lane assist, no 3D

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[Giomen]

I own now Garmin Oregon 300 for hiking and Nuvi 255 for car navigation but I'm not satisfied with Oregon small screen size and Nuvi doesn't offer any hiking support with it's limited on batteries time.
Could Garmin A50 or M10 with bigger screen replace the both I own + providing Internet access? A50-M10 seem to be a pair in screen size while A10 sems older and has slightly smaller screen)

You will have all problem of each device in one bottle (device) only!
Is there any 3rd party devices providing add some new problem!

Garmin A50 or M10 may suit for replacement for Nuvi only!