Yes I see it, but cant answer.
A repeater can be used as just only repeater or in a mesh, for you it will mean the same, only easier to administrate in a mesh. Technically it will be the same.
To answer you question there are so many more parameters needed to know.
Do you need more speed within you home network (e.g. to your NAS) or only for clients to go outside to have internet access.
If later you wont see any degrade in speed as your line speed is usually far below wifi speeds.
Simple explanation: Common wifi repeaters with no additional band for backhaul will use the wifi-bandwith for both, talking to master-router and your client. So max. wifi-speed will be shared in both directions and that means somewhat halved. As long as this is still more than your DSL-linespeed you wont see any changes or negative behavior. It will be even better, as your client gets faster wifi-connection to the repeater and needs less time slots to transmit/receive, so other clients can use the wifi channel longer and so get faster speeds.
Usually best would be to have a LAN connection from master router to repeater, than you will have full wifi speed to clients from repeater too, even true for ftth or fiber-lines.
Other considerations are: 5GHz needed or only 2,4GHz depends on your home situation and clients, many other wifi around and some more. Maybe better to go with an 1750E or 2400. I dont use repeaters but everywhere fritz-box in repeater mode with LAN or wifi backhaul (connection to master router). Reason to do so is to have DECT and LAN ports everywhere and 3 of them I got with a DSL-defect for free, you might not need DECT and then a repeater is fine.
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