You could overclock with it but I think it will run hotter than the MSI which might be more problematic. It's small odds but quoting Humbug
https://forums.overclockers.co.uk/threads/b450-msi-gigabyte-asus-asrock-boards-review-hardware-unboxed.18827089/
'I think the MSI is a 4 phase CPU VRM, as is the Aorus but there is a difference between them, the MSI board has 2 high side MosFets per inductor so 8 total, the Aorus has 8 Inductors but only 1 high side MosFet per pair with a doubler, so 4 high side MosFets, that's why the Aorus VRMs run at 120c where as the MSI VRM only runs at 85c under the same conditions, its the high side MosFets that take all the load and the MSI board has twice as many.'
2 high side mosfets per inductor on the MSI they are talking about the quality of the components on the board. It's small odds but could be all the difference between hassle and less hassle.
http://www.tomshardware.co.uk/answers/id-3742720/tdp-overclocked-amd-ryzen-2700x.html
They used a h115i water cooler and still got high temps.
Since you're looking for recommendations if none of the b450 boards meet your requirements I'd look towards one of the x470 boards.
Quote orbital walsh from the same convo:
https://forums.overclockers.co.uk/threads/b450-msi-gigabyte-asus-asrock-boards-review-hardware-unboxed.18827089/
' If any one gave me a free MSI tomahawk, ASUS Strix, Aorus Pro or ASRock 4 i'd take it in a heat beat and happily slap in a 2600 or 2700 and OC to 4.1 - 1.4v happily and game on it all day long . If i was going to do Geomapping or work that involves avx calculations then damn straight it would be a flagship X470, even if its running on stock clocks.
Why people are expecting X470 class components on budget £100 boards i'll never know.
wonder when GN will get these boards and stick some thermal probes to them'
He would overclock if someone gave him a 'free board'. You could buy the Asrock board and overclock with it but overclocking is an endeavor undertaken entirely at your own risk on your own recognisance. If you know something that says it's all going to be fine, more than a benchmark setup that runs for 24 hours to create interesting statistics, then buy the asrock.
Don't underestimate how much heat the overclock will generate.
You could say that you won't overclock by much but then it was said, 3.8 isn't any more than the turbo speed anyway but the mid 3.9-4.0 will put out some watts and the 4.2 will substitute your central heating.
On a different note also I'm not sure if you've understood the need to buy compatible memory for your board. Don't buy any old memory check the compatibility list with the board manufacturer.
https://www.msi.com/Motherboard/B450-TOMAHAWK/Specification
This spec says it has 2x 5050 rgb led connectors on the full atx version. with a heat sink on the vrm.
https://www.msi.com/Motherboard/B450M-PRO-M2/Specification
This spec says it has one led strip connector on the mATX version. But no heat sink on the vrm.