Daily savings accounts - How should one save best?

As is often the case... it depends. What are the contract terms with the [Bausparer]?

In case of doubt, you usually terminate quite quickly.

Also, the following contracts are available:

Building savings contract 1: LBS Classic F Maxi 50,000
Contract start November 2009
Balance around €1950
Interest on balance 0.75%
Loan interest would be 2.75%

Currently, the contract is only being saved with €10 monthly. My bank advisor recommended contract 2 because it would better suit my plans. In the meantime, I have changed advisors. The new advisor viewed the matter somewhat skeptically.

Contract 2: LBS Wohnriester Zuhause Flex 4L 50,000
Contract start 2011
Balance around €10,000
Interest on balance 0.25%
Currently, €110 is being saved here, plus state subsidies.
The contract guarantees me a 2.75% loan interest rate, if I see it correctly.
Who knows what the interest rates will look like in 3 years, but as of today, that wouldn’t make sense.

The entire savings rate is supposed to be increased soon.
Meanwhile, I just don’t feel well advised anymore. My new advisor just said it would be a shame about the contract initiation fees if I were to dissolve it now.

What do you all think?

Apart from the fact that there are hardly any interest rates, it looks to me as if you will almost certainly not have maturity for allocation in 3 years; for that, you would actually have to "fully" commit now. So if this is not achieved and interim financing would be necessary to use the contracts, it looks rather bleak to me. You could maybe hold them for 13 years to have interest rate security then, but by then your capital would be tied up far too early.

of that I am aware. The question is whether to resolve it in 3 years or now. For the loan, they make little sense

You can use the Riester capital for the house purchase and keep your allowances. This way you immediately have equity which you can use.
"The provider of the Riester contract must pay out the saved capital to savers for the purpose of home financing. For this, home buyers must submit a written but informal application to the Central Allowance Office for Retirement Assets (ZfA). They must prove that they have financing costs and that these expenses flow into a home that meets the specified requirements. For this, savers must submit documents, such as an excerpt from the land register, a purchase contract, or invoices from craftsmen.... The withdrawal from the old Riester contract must take place promptly in connection with the acquisition or purchase of the home. The BMF letter dated January 20, 2009 requires that the expenses must have been incurred within one month before the application for withdrawal or within one year after the payout of the Riester assets. This means you must use the money from the old Riester contract promptly to fully or partially pay the purchase price or settle craftsmen's invoices..." quoted from
ihre-vorsorge.
Google "Riester einsetzen zum Hauskauf".

This is how I would personally do it to keep the allowances...
I would personally let the first contract continue running with a initially manageable rate... you never know what the loan interest might be needed for.

if appropriate storage space is available, invest money in building materials

Actually a clever option, but it will probably mostly fail due to storage space – and it would also have to be insured against theft, "spoilage" or whatever, so again annoying...